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I have an S-Works Epic 29er frameset. I do not currently have the rear caliper adapters to accommodate a 160mm rotor. My question is, I've purchased bolts that I think are the required ones to fit once the adapters are installed. Anyone able to pull one off their bike and measure it for me? See the attached link for what I have purchased:
http://www.bti-usa.com/public/item/AV6304
Is that right or wrong?
 

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Ashima...

Basically you need to add 10mm of height underneath the caliper. I have been getting customers the Ashima (or Origin8) 160mm to 180mm post mount adaptor for a front fork. * Note: I also installed the Ashima adaptor in reverse with the shorter of the two ends being utilized for the top bolt *. With an Avid disc brake setup, you need the taller CPS washers underneath the fore of the caliper (front bolt) and a shorter CPS washer setup below the rear to prevent the bolts from binding (caused by the caliper being crooked). Then just run the same CPS washers (the shorter) on the top of both ends of the caliper.

Available from J&B. Haven't used the stock bolts included with the adaptor, so I don't know if those work. Briscoelab could tell you what length Ti bolts he ordered.

Ashima Brake Adaptor
 

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What you purchased will not work, the bolts aren't long enough (if you are using avid brakes, they very well *might* be long enough if you are using a different brand brake and aren't using the CPS washers).

The Ashima adapter listed above works just fine. There is no difference between post mount on a fork or the frame. So an adapter designed to go from a 160mm to 180mm front rotor works to space the rear from a 140mm to 160mm.

I personally think it's stupid a $hit that Specialized designed their rear brake post mounts to take a 140mm rotor (especially on the 29ers). Everyone else in the industry designs their rear post mounts to work with 160mm rotors by default.

I'll check the bolt lengths needed when I get home tonight.
 

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Several places sell them online.

You can also use an Avid adapter. If you shop deals with QBP you could just do that. Really ANY post mount adapter to move from 160 to 180 will work.
 

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Freedom Isn't Free
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My LBS got adaptors that don't have the "bridge" piece as shown above, just two post extension pieces (hard to explain). I still ran into bolt length issues.
 

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Avids.....
I run 180's in the rear (big guy)
I just went up a size in adapter. I bought a 203mm post mount adapter and it seems to work great. I haven't had it out on dirt yet since we still have snow up to our nut-sacks and more on the way. Eff this winter already......
 
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