Era Replica Automobiles 427 ROADSTER, Assembly And Service Manual

Page: 20 / 165

SECTION A -PARTS NEEDED-
20
WHEELS, BOLT-ON
Bolt-on wheels require a 4 3 /
4
" bolt circle (Chevrolet
pattern). 7" wide wheels for the front, 8 1 /
2
" or 10" rear with
3
5
/
16
"back spacing will result in the "right look." Using
wider wheels on the rear requires a change in the wheel
offset and may prevent use of the under-car exhaust system.
Custom bolt-on wheels will fit with the same offsets as the
pin-drive wheels shown here. If your wheel and/or tire
widths are significantly different, call us for advice.
Note! The front GM hubs use
7
/
16
"-20 lug nuts, the rear
Jaguar hubs have 1 /
2
"-20 thread.
Definitions:
BACKSPACING - The distance from the inside edge of the
wheel to the mounting face
OFFSET - The distance from the centerline of the wheel to
the mounting face. Positive offset is where the wheel
centerline is outside the mounting face. Negative offset moves
the wheel in toward the center of the car. (Some wheel
companies may define the offset differently. Check!).
WHEELS, PIN-DRIVE
Six-Pin (as original) 15" wheels (7 1 /
2
" and 9 1 /
2
" wide are
available from E.R.A., Vintage Wheels, Trigo and
Halibrand. The front E.R.A. hubs require non-original
backspacing. Several manufacturers (PS Engineering and
Vintage wheels, among others) make 17" wheels that are up
to 9.5" wide front, 11.5" rear.
Front Wheel Offset
Note t hat if you machine the back side of the wheel for fit,
you must maintain the pin hole depth.
Rear Wheel Offset
See page 144 for special notes.
“ Five-Pin ” pin drive wheels are also available from E.R.A.,
Trigo and Halibrand. These wheels look exact from the
outside, but use bolt-on hubs with adapters and special lug
nuts to drive the wheels.