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Hi all, I have a frame with rear PM fitting and a Hope postmount caliper. I've got 183mm and 203mm rotors.
With the 183mm rotor fitted and the caliper resting on the rotor there's about a 10mm gap between the caliper and the mounts on the frame.
Which adaptor do I need? I know Hope only do the C and H adaptors in postmount.
I'm assuming there's no chance of my using the 203mm rotor, and that 183mm will be the only way to go?
http://www.hopetech.com/page.aspx?itemID=SPG315
Mount C-Post Calipe to Post (F-203/R-203)Mount H-Post Caliper to Post (F-183)
Mount K-Post Caliper to Post (R -PM 140-PM 160)
Looks like H for 183 an C for 203
I did read that but it's not so simple. Those sizes are based on the fact that your frame is designed to be used with 140/160mm rotors without any adaptors needed. Majority of rotors go up in +20mm, so 140/160/180/200 etc.
My frame is had a weird setup in that it was designed to use 7" (175mm) rotors which, just for reference, I've not seen anywhere. I bought the frame used, and the manufacturers site states it shipped with 7" SLX brakes when new.
whats the frame? Sounds like a bit mad there. You can use the retaining ring from presta valves to space the caliper if you need to.
Are you sure it's not a misprint? There are 185 rotors from Avid about.
Probably would help if I put the frame make and model up!!!
[url= http://www.konaworld.co/bike.cfm?content=coilairdeluxe ]Kona Coilair Deluxe 2010 [/url]
Under 'Detailed Spec' it mentions the 7" SLX brakes.
[url= https://plus.google.com/u/0/photos/113108340233224814600/albums/5943273270789292401/5967040728139166834?pid=5967040728139166834&oid=113108340233224814600 ]A pic of the gap between caliper and mount[/url]
7" is 177mm and in the same way that suspension inches to mm conversions are approximate I would assume that this is going on here and they really mean 180mm rotors. The approx 10mm gap wont take into account the amount the adapter offsets the brake from the frame. If your wary of ordering head down your LBS, most will have a box of adapters that they can try (so long as you buy it from them)
the other tip would be to mount it as is and then measure the diameter that the brake will accommodate to give you a reference point to start from.
I've been to most of my LBS and they all will order in, none of them stock anything in like that.
As you can see from my postings and the link in my last post, I'm not able to mount the caliper straight onto the frame with a 180mm rotor. I don't want to be buying and sending the mounts, so I might just have to buy all the mounts and try one that fits and return the rest.
I think Wiggle are the only place that have them all in, I know CRC only have the C adaptor.
As you can see from my postings and the link in my last post, I'm not able to mount the caliper straight onto the frame with a 180mm rotor. I don't want to be buying and sending the mounts, so I might just have to buy all the mounts and try one that fits and return the rest.
Just drop the wheel out and mount it then you can measure what it is - if it comes up as 160mm then the standard 180mm PM to PM will work.
I've been to most of my LBS and they all will order in, none of them stock anything in like that.
Thats a shame - mine has 2 or 3 boxes of different ones in the workshop (shimano/avid/etc.) they all measure the same some are interchangeable (currently got shimano on hope, hope on shimano and shimano on avid here)
Thanks for the info. With regards to mearsuring, I assume I measure from centre of wheel placement to top edge of brakepads?
I don't think there's any difference in using adaptors from other manufacturers as they should all be made to required safety standards and essentially they're all spacers.
I'd measure from centre of the axle to the top of the pads.
No issue mixing and matching adapters - just be aware of the 185mm avids though.