Subject: Disk front ends
Author: David Washburn
Date: Jan 29, 2001, 7:45 AM
Post ID: 1705162706
I just finished assembling my front end and ran into a little problem. I
got the twin disk spacer from Moto Int. so I could run my single disk on
the left side instead of the right. It put the disk too close to center of
the wheel and I could not get the caliper on without shimming the whole
wheel left. I considered getting a custom shim made but Brian writes:
"Before disassembly, I measured the offset of the hub on
each side of the wheel (with respect to the outside edge of the rim) and
found that the right side is offset 6.3 mm (+/- 0.1 mm), while the left
side of the rim is offset 7.6 mm (+/- 0.2 mm). I thought that this was
peculiar (that the right side of the hub is on average 1.3 mm closer to
the outside edge of the rim than the other side) in view of the fact
that installing a disk on the LHS is a common option."
Aha, so if this is the correct offset then there is a good reason why my
disk is a little off. If I mixed up the bearing carriers while installing
new bearings it would be off 1.3 mm by Brian's calculations. I guess I
have to pull the wheel again, switch the carriers and remeasure.
For those who have Guzziology there is a nice chart that shows fork tube
dimensions and spacing. Here is a quick quiz:
(1) What big block Guzzi has the narrowest spacing from tube center to
tube center?
(2) What big block has the widest?
(3) What do they have in common?
Answers: (1) V7 Sport; (2) Eldorado/Ambassador/V700; (3) They all have
35 mm. tubes
(K.O. I expect you did well on the quiz?)
The Lemans, T, T-3 et. al. share dimensions and fall in between the two
extremes.
The disk brake Eldo is an odd duck that shares parts with the T in some
cases. Other parts are unique. Proceed with caution and take measurements
from the correct parts as the dimensions of T-3 bearing carriers are not
the same as Disk Eldos. If you can, read the discussion of bearing
carriers in Guzziology. It makes interesting reading for those of us
restoring disk Eldos.
David in NYC