Can anybody help me out with the length of the 35mm forks fitted to later models? From centre of axle to top of stanchion?
Many thanks.
Daniel.
Many thanks.
Daniel.
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35mm Fork Length
- Thread starter Bewarethemoon
- Start date
Just popped out to the garage and I find 30" or 762mm from centre of axle to top of stanchion.
Frame is 1978 and I'm assuming the forks are too.
Frame is 1978 and I'm assuming the forks are too.
Daniel, sorry about the delay, I sort of lost the thread. Measured by eye with a metal tape, I found the following:
overall length of swingarm 21¼" approx 540 mm
centre of pivot to centre of shock mount 17" or 431 mm
centre of pivot to rear wheel spindle slot 450 - 502 mm
This is on Miss November's original swing arm so that's a 1978 Special. I mention this because for all I know the specials might have different placement of the lower shock mount, although I think the more laid-down shock might be due to the top mounting being further forward on the special frames.
overall length of swingarm 21¼" approx 540 mm
centre of pivot to centre of shock mount 17" or 431 mm
centre of pivot to rear wheel spindle slot 450 - 502 mm
This is on Miss November's original swing arm so that's a 1978 Special. I mention this because for all I know the specials might have different placement of the lower shock mount, although I think the more laid-down shock might be due to the top mounting being further forward on the special frames.
I'm tweaking this to fit into my project.
Raymond, was that with the fork fully extended (i.e. front wheel off the floor)
Somehow, I think 762 mm sounds a bit short. But I have been wrong before ;-)
Ah, No, not fully extended - bike on centre stand so some weight on the front wheel. Very good point, @arcticXS.
Just been to the garage, jack under front of engine, wheel off the floor, with forks fully extended 30¼" or 768mm from centre of wheel spindle to top of stanchion. Hope this has not caused any problems for @Bewarethemoon.
Also, to be clear, the overall length of swingarm 21¼" approx 540 mm is overall length, not from centre of pivot.
I just had to measure the fork on my 77 standard (to satisfy my own curiosity, mainly) And I found it to be 775 mm from axle center to top of stanchion tube (excluding the cap/plug).
Maybe the 7 mm discrepancy is due to damper rod design changes between 77 and 78? Or maybe Raymond's 78 has top out springs installed?
Maybe the 7 mm discrepancy is due to damper rod design changes between 77 and 78? Or maybe Raymond's 78 has top out springs installed?
When I lifted the wheel off the floor, I made sure to push down on the fender to extend the forks - I don't know why there is a discrepancy. What are top out springs?
Top out springs most often are short (20-40mm) springs that sit outside the damper rod. The purpose is to be a soft stop when the fork is fully extended, like when accelerating hard enough to unload the front suspension fully. Without these springs you sometimes feel a knock or thud when giving it the beans from a standstill. AFAIK, later XS models have these installed .
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Confirmed.
