A WinDerby Original

It just keeps getting better!

NOW LIGHTER AND STRONGER

WDULC

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

LESS MASS(in the right places)
= LOWER MOI

This represents a reduction in mass of up to 57.0% and a 65.8% reduction of rotational inertia.

*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 WDC …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 1.88 grams. This means it takes less energy to get the wheels rolling. Less mass reduces rotational Inertia.