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Author Topic: twin 4 pot R1 calipers touching spokes - TR1 cafe build  (Read 329 times)

Offline Oneorangedog

  • Posts: 15
Hi,
I am working on a TR1 cafe build and have come across a problem.
My twin front calipers [R6 radial type] are only 0.5mm distance each from the spokes - and I wondered if there were any narrow 4 pot calipers out there that fit the 108mm bolts to the GSXR USD forks?

Or has anyone had experience of skimming the inside face of the calipers a couple of mm's?

Some details:
GSXR USD forks
CB750/Goldwing hub
19 inch spoked rim
twin R1 320mm discs

Any help appreciated - if I can't find a narrow caliper I will need to re-make the triple-trees!

Thanks
« Last Edit: Apr 27, 2018, 13:50:27 by Oneorangedog »

Offline ex119x

  • Posts: 46
Re: twin 4 pot R1 calipers touching spokes - TR1 cafe build
« Reply #1 on: Apr 28, 2018, 00:33:59 »
Would going to even bigger discs and spacing the calipers farther out, give you the clearance you need?

Offline hillsy

  • Posts: 4117
Re: twin 4 pot R1 calipers touching spokes - TR1 cafe build
« Reply #2 on: Apr 28, 2018, 01:43:39 »
You can safely take a mm of two off the inside of the calipers.

Offline Oneorangedog

  • Posts: 15
Re: twin 4 pot R1 calipers touching spokes - TR1 cafe build
« Reply #3 on: Apr 28, 2018, 05:49:47 »
Thanks ex119x and Hillsy
I think I'm going to do both of these suggestions.
I will skim the caliper first, chamfered at the angle of the spokes to give the max clearance.
Then if that is still not enough, I will upsize to 330mm discs.

I chatted with a brake caliper expert too and he suggested that skimming calipers was common for converting older spoked wheels to disc brakes.
Cheers