[Lelandjt]

My bike comes with Guides & 200mm Sram rotors. I'm gonna replace them with XTR Trails and 203mm RT86 rotors. Can I use the Sram caliper adapters or would Shimano adapters put the caliper in a slightly different place? The frame & fork are both 7" post mount.

 

[Gary]

I'm running one bike with guides and 203mm (non sram) rotors and using shimano adapters. If you wanted to re-use your 200mm Guide adapters I'd have thought you'd want 1.5mm of washers under the caliper to space it out to match the 203mm rotor to give the caliper correct clearance. (you might get away with it though)
Shimano adapters are really cheap here ~ £5. I'd probably just order a set. if only to save looking for the washers when I forget about them when removing a caliper in a car park/my kitchen.

 

[Lelandjt]

That's what I suspected. It's an excuse to buy the hollow XTR ones and save a few grams. Weight weenie 170mm 29er project!

 

[HAB]

Yeah, your adapters for 200mm worrie will need to be shimmed out 1.5mm to work on a 203mm.

Magura makes a better adapter for that setup IMO, because it uses tot sets of bolts so that the ones fixing the caliper to the adapter go totally perpendicular to the mounting face on the caliper. It's not a huge deal or anything, but it does mean that the caliper isn't as prone to moving when you tighten it down, as compared to the style of adapter that uses two long bolts. Just a little easier to use.

 

[6thElement]

I think I've got two new 203mm Shimano adapters I bought for a build two years ago and discovered they were unneeded. If you're in Breck it won't take long for USPS to roll along I-70 with them, a few bucks and postage is all I'd be after. I'll go dig out the part number on them if interested.

 

[Lelandjt]

I might be interested when I get back to Breck at the beginning of June. I'm gonna look into the Magura adapters cuz I've never liked the angled bolt thing.

 

[HAB]

I might be interested when I get back to Breck at the beginning of June. I'm gonna look into the Magura adapters cuz I've never liked the angled bolt thing.

http://www.jensonusa.com/Magura-Disc-Brake-Adaptors

QM26 is the specific one.

 

[Gary]

29er project!

I feel dirty now i helped!

You can't just wash that shit off you know.

 

[Lelandjt]

http://www.jensonusa.com/Magura-Disc-Brake-Adaptors

QM26 is the specific one.

Yeah, I looked it up on QBP and I like the idea. I think I'm gonna get a pair and replace the bolts with Ti to ease the weight penalty.

 

[Lelandjt]

I feel dirty now i helped!

You can't just wash that shit off you know.

All of us at the shop feel awkward and greasy with the whole subject of 29ers. We still don't like them but a few of us now own one and we no longer try to talk every customer out of one, just the short people.

 

[WestCoastHucker]

I feel dirty now i helped!

You can't just wash that shit off you know.

like unknowingly consenting to rape...