Ultra-Lite Xtreme Cut
Speed Wheels
and Exclusive

NEW from WinDerby

microC
Speed Wheels
FAST & FORGIVING
Your "C"-cret Weapon against Friction"

Let's Talk Wheels...

ALL WinDerby Wheels are MOLD MATCHED, BORES REAMED and HAND POLISHED!

Wheels may be the single most important component of a fast car. The stock BSA Pinewood Derby® Scout molded wheels leave a great deal to be desired when maximum speed is a goal. They lack the essential features that make a wheel... "a wheel" . They are slightly out of round, the tread is uneven, the bores are tapered and they vary in size. You would be surprised at the mold variations, defects and inconsistencies in the out-of-the-box wheels (or maybe you wouldn't).

Dr. Jobe has published some wheel bore measurements in Lecture 12 - Data on Standard Wheel Bores

WHEEL NEWS - They have re-introduced the 6's and 7's. But stopped the 17's and 18's. That's fine with me. I was getting tennis elbow from tossing them into the trash. I've noticed a lot of wobble in the new batch during my wheel selection process. The quality has certainly changed since last years batch. The material seems to have changed as well. I am noticing a difference in the way the new wheels cut. I'll let you know what I find after some more testing.

Matching all of the mold numbers in a set of wheels it's no guarantee of perfect match. The hub bores vary quite a bit in diameter as well as the taper of the bore. Even within the same mold number! I have thrown out more wheels this year than ever. That's why I spend so much time selecting, turning, reaming, shaping and polishing.

There's no mass production line here at WinDerby. I, personally, machine each and every wheel, one at a time, with attention paid to detail and quality. Here are just a few of the steps that I take with every single one of the wheels I prepare:

First, I hand select the best wheels and sort them into matched sets. This helps to make sure the finished set can be machined with the same set up for uniformality.

The matched sets are then lightly lathed round and concentric to the wheel bore. The tread edge is left in tact (except for "V" cut). I polish every wheel by hand with my special blend of GM. No mass production here.

I ream the hub bores to remove the taper and make the bore sizes equal (very important).Then I polish the inside of the bore til it shines like a mirror. I square the hub face and give it a shine with my GM for the ultimate smooth and polished surface both inside and out.

After a final inspection, everything is packaged and protected for shipping. I take a lot of pride in providing the best BSA wheels on the market. My quality and craftsmanship speak for itself.

SlickSilver™ is a wheel bore treatment that I developed using my proprietary blend of Graphite and Molybdenum. My process creates a wheel bore finish that is ultra smooth, ultra slick and shines like a mirror!

SlickSilver™ Pro Bore Treatment is included as a standard process on ALL of my Speed Wheels.

All WinDerby Speed Wheels are...

  • OFFICIAL BSA
  • MOLD MATCHED SETS
  • MACHINED ROUND AND CONCENTRIC
  • HAND POLISHED HUB FACES
  • WHEEL BORES REAMED AND ULTRA-POLISHED with WINDERBY SLICK SILVER™ PRO BORE TREATMENT
  • A FINAL HAND POLISHING..
  • and READY TO ROLL RIGHT OUT OF THE BOX

The only addition prep I would recommend would be a final wheel bore buffing with a thick, cotton pipe cleaner and GM-Lube.

IMPORTANT: A smooth and polished wheel bore is a great start. But, it's not a enough. Take it to the next step. The wheel bore must be properly treated and completely coated with graphite in order to properly reduce the coefficient of friction (COF). Spinning the wheel simply won't do that.

These are the new Official BSA Pinewood Derby® Scout wheels (with "OFFICIAL B.S.A., MADE IN USA," on the inside and raised letters on the sidewall which read "BSA PINEWOOD DERBY®") and are lathe turned to a standard diameter. The turning lightens the wheel (LIGHTER WHEELS ARE FASTER. Less mass = Lower Moment of Inertia) and removes the bump at the molding seam1. LATHE TURNED WHEELS RUN FASTER! Check local rules for legality.

1 - PLEASE NOTE: Although the "Mold Bump" is COMPLETELY REMOVED, the DISCOLORATION of the mold mark may still be visible as it may extend deeper into the material on some wheels. However, this is ONLY A DISCOLORATION of the plastic. Rest assured, wheel is GUARANTEED TO BE SMOOTH and will not interfere whatsoever with the performance. I want to maintain the LARGEST POSSIBLE DIAMETER while still providing an even and smooth surface and PRESERVING THE TREAD EDGE as required by many rules.

IMPORTANT: The products and construction techniques described are all developed to improve the performance of your pinewood derby cars. Please consult your local racing rules as some of the methods and / or products may be not be allowed.TOP

Internet Content
Rating Association

Wheel Comparison Chart

  • Stock wheels: 2.558 seconds(slowest)
  • Smooth wheels: 2.413 seconds
  • "H" wheels: 2.385 seconds
  • "V" wheels: 2.360 seconds(fastest)

The above times were measured using a Slim Maxi-L and the old BSA Scout wheels on a 32 foot electronically timed wooden track with a 5 foot drop. Each .01 second represents about 1.5 inches at the finish line.

Take a look at some interesting test data regarding my different wheels and the effects of inertia and tread shapes on speed.Lecture 6- Testing Hodges Wheels

Lecture 5 - How To Calculate the Moment of Inertia of a Wheel

 

Does raising one wheel really reduce your friction by 25%?? If you want SPEED you'll wanna READ. Lets separate FACT from FICTION with
Lecture 11 - Debunking Another Friction Myth.

MOLD MATCHED SPEED WHEELS

with

Note from Jerry: Before you buy, you may ask yourself (as you should) - "Is this just one more of those Derby Myths?" - The answer, I'm proud to say, is NO! This, like all of the products on this site, has its roots in physical law, hands on experimentation and craftsmanship. Again, I encourage you to download and study the Lecture Series by Dr John Jobe, conduct your own experimentation and let Physics seperate Fact from Fiction.

Remember that there are many factors that will affect the performance of your car such as alignment, weight placement, rolling friction, sliding friction, moment of inertia, and track conditions (just to name a few). Individually, each is just one piece of a puzzle with many interdependent measures. Recommended Virtual Racing and Gravity Driven Car Design.

 

Looks like a smooth tread - Performs like an "H".

Just like the other WinDerby Speed Wheels, it all starts with a BSA wheel that is prepared with a smooth and true tread surface. Then a proprietary secondary process creates a slight, nearly invisible, precisely controlled shape to the tread surface that exploits an inherant flaw in the molding process. The µC™ surface has all the benefits of an "H" wheel, but without the "H". Check out Lecture 6- Testing Hodges Wheels. It's easy to see the influence rolling friction can have on a wheel.

Micro C Speed Wheelsyou at the finish line

  • DIA: 1.180" (avg. - wheel sets match)*
  • BORE DIA: .098" - Reammed & Polished with SlickSilver™
  • HUB: Face sanded and Polished with SlickSilver™
  • WEIGHT: 3.40 grams each (avg.)**

due to wheel/mold characteristics,
values are approximate
* Wheel Diameter +/- 1%
** Wheel Weight +/-3%
This data is for comparison

Another WinDerby Original

NEW µC™ Speed Wheels

(SET OF 4)
MOLD MATCHED, REAMED and POLISHED
BSA MARKINGS ARE INTACT INSIDE AND OUT

After much work WinDerby is pleased to anounce the release of..

Micro C Speed Wheels Speed Wheels!

You may have noticed, some of the standard BSA wheels have an inherant flaw that can actually work to your advantage. If the plastic is not adequately cooled before being released from the mold, the wheel tread tends to deform and sink in . This sink can actually result in a faster ride. This creates a sort of "H" wheel that is (ironically) perfectly legal. I've taken "the Physics behind the Flaw" to the next level by adding uniformality and precise repeatability to this phenomna to create a tread surface with superior qualities that can still be BSA legal and meet the minimum 8mm tread width rule for WIRL races as well. .TOP


IMPORTANT: Please consult your local racing rules as some of the methods and / or products may be not be allowed.TOP

Item #H65

Micro C Speed Wheels

$16.95

"The important thing is not to stop questioning".
- Albert Einstein

Why do racing bicycles have skinny and hard tires?

Why is it harder to pedal a bike through sand?

Why does an under inflated car tire reduce your fuel efficiency?

How does the µC™ tread characteristics reduce the effects of rolling friction? F=CrrNf

 

  • DIA: 1.180" (avg. - wheel sets match)*
  • BORE DIA: .098" - Reammed & Polished with SlickSilver™
  • HUB: Face sanded and Polished with SlickSilver™
  • WEIGHT: 3.40 grams each (avg.)**

due to wheel/mold characteristics,
values are approximate
* Wheel Diameter +/- 1%
** Wheel Weight +/-3%
This data is for comparison

Matched Smooth Cut Speed Wheels (set of 4)

(SET OF 4)
MOLD MATCHED, REAMED and POLISHED
BSA MARKINGS ARE INTACT INSIDE AND OUT

These are Official Pinewood Derby® BSA Mold Matched Wheels that are hand selected to optimize performance. Each wheel is then turned round, smooth and lightly polished. The hubs are reamed and then gently polished with my Graphite-Moly blend for exceptional performance right out of the box.TOP


IMPORTANT: Please consult your local racing rules as some of the methods and / or products may be not be allowed.TOP

Item #H62

$11.95

Item # H62-B2B
Original Style / without
wheel, bore and hub polish

$9.95

 

  • DIA: 1.180" (avg. - wheel sets match)*
  • BORE DIA: .098" - Reammed & Polished with SlickSilver™
  • HUB: Face sanded and Polished with SlickSilver™
  • WEIGHT: 3.30 grams each (avg.)**

due to wheel/mold characteristics,
values are approximate
* Wheel Diameter +/- 1%
** Wheel Weight +/-3%
This data is for comparison

"H" Cut Speed Wheels (set of 4)

(SET OF 4)
MOLD MATCHED, REAMED and POLISHED
BSA MARKINGS ARE INTACT INSIDE AND OUT

"H" wheels are turned smooth then undercut about .004" in the center of the tread, leaving small, flat running edges on both sides. The hubs are reamed and then gently polished with my Graphite-Moly blend for exceptional performance right out of the box. They are faster than Smooth Tread wheels and the undercut is barely visible to the eye - but not invisible! TOP


IMPORTANT: Please consult your local racing rules as some of the methods and / or products may be not be allowed.TOP

Item #H23

$12.95

Item # H23-B2B
Original Style / without
wheel, bore and hub polish

$10.95

 

  • DIA: 1.180" (avg. - wheel sets match)*
  • BORE DIA: .098" - Reammed & Polished with SlickSilver™
  • HUB: Face sanded and Polished with SlickSilver™
  • WEIGHT: 3.00 grams each (avg.)**

due to wheel/mold characteristics,
values are approximate
* Wheel Diameter +/- 1%
** Wheel Weight +/-3%
This data is for comparison

"V" Cut Speed Wheels (set of 4)

(SET OF 4)
MOLD MATCHED, REAMED and POLISHED
BSA MARKINGS ARE INTACT INSIDE AND OUT
TREAD RIBS ARE REMOVED

The "V" cut wheels wheels are VERY fast! The small (and very visible!) peak reduces rolling friction to a minimum (Lecture 6- Testing Hodges Wheels). A lot of material is removed to make the "V" thus creating a much lighter wheel. LIGHTER WHEELS ARE FASTER. Less mass means it takes less energy to get it rolling (rotational inertia). NOTE: Because of the amount of material removed, the ribbed tread edge is removed. Check your rules. A must for the fast car. TOP


IMPORTANT: Please consult your local racing rules as some of the methods and / or products may be not be allowed.TOP

Item #H09

$13.95

Lecture 6- Testing Hodges Wheels

Item # H09-B2B
Original Style / without
wheel, bore and hub polish

$11.95

Speed Kit 1

(SET OF 4)
MOLD MATCHED, REAMED and POLISHED
BSA MARKINGS ARE INTACT INSIDE AND OUT

The Speed Kit contains a set of the H62 Matched Speed Wheels (above) along with 4 of our H50 premium Speed Axles. What a combo! TOP

Item #H63

$13.65

 

 

 

 

 

Speed Kit 2

(SET OF 4)
MOLD MATCHED, REAMED and POLISHED
BSA MARKINGS ARE INTACT INSIDE AND OUT

The Speed Kit contains a set of the H62 Matched Speed Wheels (above) along with 4 of our H46 Lathe Turned Speed Axles. These are the OFFICIAL BSA AXLES that have been precision turned with a grooves that removes the nail forming marks from the shaft and a precision taper on the head to reduce contact area with the wheel face.
. Pretty Slick! TOP

Item #H64

$18.95

ULTRA-LITE SPEED WHEELS

with

WinDerby - Where "INNOVATION" beats Imitation!

Newton Moment of Inertia - In reference to wheels, rotational Inertia is an objects resistance to change of rotation. The measure of inertia is the object's mass. The greater the mass, the more energy it takes to get the object rotating. Give a golf ball a light push then do the same to a bowling ball. The golf ball rolls pretty easily. Applying the same force to the bowling ball has little or no effect. It will take a lot more energy to set the bowling ball into motion because of its greater mass. It's interesting to note that objects with IDENTICAL MASS can have a DIFFERENT MOMENT of INERTIA depending on their shape or distribution of mass.

These wheels look stock. All of the mold text features are intact and ready for inspection.

CAUTION: These Wheels are HOT!

IMPORTANT: Please consult your local racing rules as some of the methods and / or products may be not be allowed.TOP

  • DIA: 1.180" (avg. - wheel sets match)*
  • BORE DIA: .098" - Reammed & Polished with SlickSilver™
  • HUB: Face sanded and Polished with SlickSilver™
  • WEIGHT: 2.40 grams each (avg.)**

due to wheel/mold characteristics,
values are approximate
* Wheel Diameter +/- 1%
** Wheel Weight +/-3%
This data is for comparison

A WinDerby Original

NEW and IMPROVED!

ULS and ULC

(SET OF 4)
MOLD MATCHED, REAMED and POLISHED
BSA MARKINGS ARE INTACT INSIDE AND OUT

LESS MASS(in the right places)
= LOWER MOI

Wheel

m (grams) aprox.*

I (g/cm2) aprox.*

BSA Stock

3.6

5.12

Original UL27

2.7

3.28

ULS/ULC

2.4

2.76

*due to wheel/mold characteristics,
values are approximate (+/- 3%) .
This data is for comparison to illustrate the UL Advantage

ULTRA-LITE Smooth Cut Speed Wheels

Although it's very flattering..
BEWARE OF CHEAP (and expensive) IMITATIONS

Looks can be deceiving. These guys are made from Official BSA Pinewood Derby® Wheels that are mold matched then lathe turned round and concentric with reamed and polished hub bores. Just like the H62's ...with one major difference.

These wheels are turned from the inside to remove material from the inner tread surface. The average wheel weight of the ULS is reduced to about 2.4 grams. This means it takes less energy to get the wheels rolling. Less mass reduces Moment of Inertia.

TOP

Item #ULS

$22.45

Turn 'em into a µC™ and reduce rolling friction too!

µC™ has essentially the same MOI as the ULS. The µC™ tread characteristic has the added benefit of reduced rolling friction. F=CrrNf

Item #ULC

$26.95

A standard 1999 style BSA wheel weighs about 3.6 grams with a moment of inertia of around 5.12 g/cm2

If you want to learn more check out Lecture 5 - How To Calculate the Moment of Inertia of a Wheel

 

NOTE: The "H" cut is very obvious. This type of extreme modification is normally allowed only in open class racing. Make sure your rules allow for this type of modification before you buy. If so, get ready for a fast ride!

  • DIA: 1.180" (avg. - wheel sets match)*
  • BORE DIA: .098" - Reammed & Polished with SlickSilver™
  • HUB: Face sanded and Polished with SlickSilver™
  • WEIGHT: 2.40 grams each (avg.)**

due to wheel/mold characteristics,
values are approximate
* Wheel Diameter +/- 1%
** Wheel Weight +/-3%
This data is for comparison

A WinDerby Original

NEW and IMPROVED!

ULH

(SET OF 4)
MOLD MATCHED, REAMED and POLISHED
BSA MARKINGS ARE INTACT INSIDE AND OUT

LESS MASS(in the right places)
= LOWER MOI

ULTRA-LITE "H" Cut Speed Wheels

Wheel

m (grams) aprox.*

I (g/cm2) aprox.*

BSA Stock

3.6

5.12

Original ULH27

2.7

3.28

NEW ULH

2.4

2.76

*due to wheel/mold characteristics, values are approximate (+/- 3%) .
This data is for comparison to illustrate the UL Advantage

A cut above the ULS. An "H" Cut to be exact. We have managed to put an "H" cut on these wheels to reduce the apparent contact surface area by more than 80% thus further reducing the weight and thus the Moment of Inertia. The measurable benefit over the smooth cut is the reduction of rolling friction.

TOP

Item #ULH

$23.95

Check out some interesting results with regards to rolling friction. Lecture 6- Testing Hodges Wheels

I keep the "H" cut to a minimum to maintain the structural integrity of the tread area. But a little bit goes a long way. The minimized apparent surface contact area makes for a very forgiving and fast wheel.

All of the mold text features are intact and ready for inspection.

IMPORTANT: Please consult your local racing rules as some of the methods and / or products may be not be allowed.TOP

ULTRA-LITE XTREME CUT SPEED WHEELS

with

NOTE: The "V" cut is very obvious. This type of extreme modification is normally allowed only in open class racing. Please check your rules before you buy.

?? DID YOU KNOW... a ULVX will outperform any 1 gram smooth tread wheel due to the reduction of rolling friction? Check out Lecture 6- Testing Hodges Wheels.

  • DIA: 1.180" (avg. - wheel sets match)*
  • BORE DIA: .098" - Reammed & Polished with SlickSilver™
  • HUB: Face sanded and Polished with SlickSilver™
  • WEIGHT: 1.35 grams each (avg.)**

due to wheel/mold characteristics,
values are approximate
* Wheel Diameter +/- 1%
** Wheel Weight +/-3%
This data is for comparison

A WinDerby Original

ULTRA-LITE "V" Xtreme Cut Speed Wheels

(SET OF 4)
MOLD MATCHED, REAMED and POLISHED
BSA MARKINGS ARE INTACT ON OUTSIDE ONLY
TREAD RIBS ARE REMOVED

These may be the lightest and fastest open class BSA wheels that I have made (so far). I have reduced the weight of the ULVX's to about 1.35 grams each from the hefty 3.6 grams stock BSA. The moment of inertia is chopped to about 1.7g/cm2 (5.12g/cm2 stock BSA typ.) and the "V" Cut has measurable advantages in the reduction of rolling friction (see Lecture 6- Testing Hodges Wheels). This represents a reduction in mass of 72% and a whopping 67% reduction of rotational inertia.

Wheel

m (grams) aprox.*

I (g/cm2) aprox.*

BSA Stock

3.6

5.12

ULVX

1.35

1.67

*due to wheel/mold characteristics, values are approximate (+/- 3%) .
This data is for comparison to illustrate the Xtreme Advantage

NOTE: All of the inside mold features are removed

IMPORTANT: Please consult your local racing rules as some of the methods and / or products may be not be allowed.TOP

Upgrade to the new
Xtreme Cut Item #ULVX

NOW $25.95

Limited Time Offer: FREE H50 SPEED AXLES with each set of ULVX's

IMPORTANT: While there are obvious advantages to this type of Xtreme Cut wheel design, there are also obvious trade-offs. I have done my best to push the envelope while maintaining the structural integrity of the wheel. But keep in mind that this wheel has a lot of material removed. Care must be taken during handling. If you have a really bumpy track or uneven seams then you may want to consider the ULS, ULH, or ULC wheels for open class performance as the cross sectional area is a bit more robust.


The balance is so precise that you can stand these wheels on edge (as shown in picture). Now that's balanced!

Each set of (4) comes with 5 precision machined Speed Axles made specifically for the RS wheels.by DerbyWorx

See what people have to say about these...Pinewood Proboards.

RS Racing Wheels by DerbyWorx

These wheels were created by DerbyWorx with one thing in mind.. "SPEED!". Don't think that these are your typical thin cut wafer wheels. The RS's are C.N.C. machined from a solid piece of Delrin with exacting precision. Even the wheel bore is milled round, not drilled, for unsurpassed precision.

Take a closer look and you'll notice that the RS's are not just plain flat discs. This is no mistake. This is a Patent-Pending Anti-Friction feature. This strip will limit the contact area of the wheel with the guide strip to a .002" or .0002 sq. inches(By comparison other wafer, razor or open class wheels that are flat on both sides have a contact area of .25" or .108 sq"). The contour then cuts back into the wheel to optimize weight, symmetry and balance. The hubs are also beveled to minimize contact area to the body.

These beauties weigh in at 1.17 grams each. This means it takes less energy (rotational inertia) to get the wheels in motion. The weight you save in the wheel gets put back into the body where it has the most benefit. NICE!


IMPORTANT: Please consult your local racing rules as some of the methods and / or products may be not be allowed.TOP

Item #H105
"Compare and Save"
was $24.95
NOW ONLY $22.95

Regular Scout Wheels w/Axles (set of 5)

These are the official Scout Grand Prix Pinewood Derby® wheels and axles. They are the "new" wheels with "BSA Pinewood Derby®" in raised letters on the side wall.

TOP

Item #H44
$2.85


March 29, 2008 Updated

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