Wheel sizes and offsets

WHEEL SIZES AND OFFSETS

Note - For widths not list here, following the centerline-to-mounting face or mounting face-to-outside edge dimension is preferable to using the backspacing specification. Unfortunately, most wheels are sold by the backspacing dimension, so the other dimensions must be calculated. (Tire Size Calculator)

PDF drawings of Pin-drive wheels (Backspace similar to bolt-ons of the same width	Front Wheel Drawing Rear Wheel Drawing
Bolt-on hub dimensions	*All dimensions are +/- 0.15"*

Bolt-on Wheels

15" Torque-Thrust:

Note that the optional Wilwood brakes will not fit in these wheels!
Halibrand has a similar wheel that may fit the Wilwoods, but we haven't tried them.


A Dimensional Comparison of 15" FIA and 427 Pin Drive Wheels
Both the FIA (left) and 427 (right) are shown. Note that the wheels on both cars come very close to the bodywork. The 1/2" difference between the wheel offsest will very likely make the wheel rub. At the very least, it will look "wrong".
The same problems occur in the rear.

17" Wheels: The backspacing is the same for bolt-on and pin-drive designs
The distance from mounting face and inner face is critical for Wilwood caliper clearance. These wheels may be used with 275/40 and 315/35 tires. Note! Add 0.3" to the backspacing when used with the ERA rear suspension.
	*Safety wiring of the pin-drive-wheel wing nut shown here.*

Rear variations

It's important to note that the under-car exhaust cannot be used with wheels with more than 3.88" backspacing.