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Hi,
I bought a new Sonder Transmitter (XL frame) a few weeks ago. It came with 180mm/160mm discs. I have a spare 203mm rotor so tried going for the next disc size up front and rear. No success. All the +20mm adapters I have result in the front SRAM caliper misaligning with the front disc and the rear SRAM caliper hitting the rear frame.
Does a reduced offset front fork need a different kind of adapter? And does the rear frame preclude any form of upgrade? (The Transmitter is the only bike I've seen that places the rear caliper inside rather than on top of the rear triangle.)
Thanks in advance for pearls of wisdom.
🙂
C
ive just gone from 160mm to 180mm on the back of my 2020 XL transmitter.
straight 20mm PM adaptor worked for me.
I bought this one if it helps you identify. https://www.chainreactioncycles.com/shimano-front-disc-mount-adaptor-post-to-post-/rp-prod13747
I had to use one washer on one mount, but apart from that it fits fine.
let me know if you want any more info or pics of mine.
cheers
Okey dokey, thanks for this. My LBS tried adding a 20mm post adapter but the Guide R caliper impacted on the inside of the frame, albeit only slightly. The paint on the frame is pretty thick mind so it might be the paintwork that's getting in the way. Hmm. I will have a think!
180 to 203 is a 23mm difference, so the front is presumably a bit too large diameter to fit the caliper properly. A washer or two under the caliper or adapter should sort that.
I took some pictures of our Medium Transmitter 180 on rear with Avid post mount spacers (one is longer than other) and front Shimano 203 adapter.
I did exactly the same, 203 on the front, shift the 180 to the back. It was tight getting the caliper on the new mount inside the rear triangle, but it did fit. Mines got the Sram Level calipers, maybe the Guide RS is a larger caliper.
Edit: my phones just loaded the pics above - doesn't look like that's the problem.