Disc Brake Caliper 34mm Forks

Crackers61

Crackers61

Crackers61
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Hi All,

I'm chasing some info on disc caliper sizes. I have an earlier set of forks 34mm and wondering what disc calipers fit? I know the later model calipers don't fit.
I've seen XS's with calipers that bolt directly to the forks unlike the later models that use the floating caliper.

Can someone set me straight? I'm a bit lost.

Thanks
Crackers.
 
Hi Crackers,
I've never tried it but will the late model calipers fit on the 34mm fork lowers?
If they do fit on the forks didja try 'em with the late model one-piece brake disks?
 
Can use the 76 Caliper also. The top bolts need to be swapped over to be either mounted on the front or rear of the forks..........there is no real left and right on these early calipers, so is an easy twin disk set up
72-75.........................................76. Pic is from an Aussie twin disk model
XS Forks (2) copy.jpg P1090823 copy.jpg
 
Hi Guys,
Thanks so much for the information and the pictures. I was under the impression the new calipers would fit, and yes i've tried them with the one piece bracket. But now know they don't fit.
Thanks
Crackers.
P.S.
Does anyone have a set for sale, only problem is i'm on the other side of the big pond to you guys..... so postage is the problem.
 
Those early calipers weigh a ton...........

What are you after i have some calipers that need refurbishing and can have a look..............Area you live could help.
 
Hi Mate,
I'm after a caliper that suits the 34mm forks. From guys posting on this site, suggested 73 to 76 vintage will fit. So i known that the later model 78 onwards don't fit my forks. The caliper should bolt on directly to the fork, and dosen't use a separate braket like the later models.
Thanks
Crackers.
 
650Skull said:
Can use the 76 Caliper also. The top bolts need to be swapped over to be either mounted on the front or rear of the forks..........there is no real left and right on these early calipers, so is an easy twin disk set up
72-75.........................................76.
Click to expand...
s-l225.jpg

1972-76 brake pads have protruding "ears" that fit into slots in the caliper body. The slot is "in front of" the caliper on 72-75, and "behind" the caliper on 1976. The ears will contact the fork leg, interfering with brake action, if you use the wrong caliper body. The ears can be trimmed to correct this.
 
Last edited:
DogBunny said:
View attachment 119181
1972-76 brake pads have protruding "ears" that fit into slots in the caliper body. The slot is "behind" the caliper on 72-75, and "in front" of the caliper on 1976. The ears will contact the fork leg, interfering with brake action, if you use the wrong caliper body. The ears can be trimmed to correct this.
Click to expand...

Yes this is true. I stand corrected from when i said there is no real left and right........... Yamaha did make a left and right for the 34mm fork twin disc set up. Using the right caliper on the left does cause this problem for you guys in the states
 
Once again, I got the years reversed. The slot is "in front of" the caliper on 72-75, and "behind" the caliper on 1976. I have corrected my earlier post.

BTW -- from a physics standpoint, moving the caliper behind the fork leg in 1976 is a pretty obvious improvement in my opinion. It occurred to me that on 1972-1975 models you could swap the fork legs and put the appropriate caliper body on the left leg, where it would now be behind the fork leg. Everything should swap no problem, except that the speedo would no longer work, and you'd have to figure out brake line routing and possibly fab a new line. I think you'd see a noticeable improvement in braking.
 

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