Topic: 750 vs. 550 forks??

[chippyfive50]

Is the only difference between a cb 500/550 fork and a 750 fork the length of the 35mm down tubes / spring strength??
(I want to  put the shorter 500 tubes in the 750 bottoms.)  anyone anyone??

[bryanj]

If you do you will have to use the 500 braking system, disc, caliper, caliper bracket

[dusterdude]

bryan,he wants to put 550 tubes in the 750 legs,that shouldnt affect the brake setup should it?

[n9viw]

So long as he uses the 550 internal pistons with the 550 tubes, his plan will work flawlessly. The 750 uppers are 1.5" longer than those of the 550, and the 750 lowers are 0.5" longer than those of the 550, so he will see a total redux of 1.5". (I received this information from the gal at Forking by Frank, the late Frank's wife IIRC)
And yes, the relative brakes must follow their lowers. On my 550, I plan to mount a pair of 750 forks and a 750 front wheel to take advantage of the increased leverage of the slightly larger 750 brake disk. It's this disk (in addition to mounting-hole spacing) that constitutes the difference between the 550 and 750.

[chippyfive50]

Hey n9viw,
     Thanks for the help, you are on the money all the way around on my intentions. I want to use the 750 wheel / disks as well, but you are saying the bolt patterns are different from a 550 to a 750??
so now  I need a 750 wheel/hub  as well?