Brakes mount adaptor IS caliper to Post Mount fork

[Hilton.]

I need some help locating some parts, and If any of my fellow hubbers could help me out, t'would be much appreciated.

 

I recently got an oldish set of 6" (160mm) IS caliper brakes. The rear caliper fits nicely onto my rear IS brake mounts. The front though ... is a hassle

 

I'm essentially looking for either of the following:

http://clee-cycles.co.uk/images/kcnc/brakes/post-is180.jpg

The KCNC black spacers that come with the above KCNC adaptor (I've got the adaptor, not the spacers: Without the spacers, it fits 160mm IS caliper to 160mm PM fork, or 180mm with spacers).

My problems with the using adaptor alone are described in next post.

 

Next option:

http://www.chainreactioncycles.com/Images/Models/Full/13735.jpg

The above Hope +20mm adaptor fits the IS caliper to a PM fork for use with a 180mm rotor. That should be exactly what I need, as I have both 160mm and 180 mm rotors, but would prefer to use the 180mm.

[Hilton.]

My problem:

 

This is what I would like my post mounts to look like:

http://farm6.static.flickr.com/5060/5419251734_792c1ff9b4_z.jpg

Note the nice skinny post mounts. (Here the caliper is 180mm IS, not like my 160mm IS caliper, but that's not important)

 

This is roughly what it looks like when I try using the KCNC adaptor:

http://farm6.static.flickr.com/5218/5428755309_5b3ca756b6_b.jpg

Notice the gaps between the post mounts and the adaptor. This isn't my pic, but mine looks almost identical.

 

The problem is the that adaptor is nicely machined to fit skinny post mounts, such as pic 1, but my cheapish fork has fact rectangular (6" / 160mm) post mounts, so it wont fit flush against the mounts.

[Hilton.]

mid morning BUMP

[Hilton.]

Anybody?

[RockCoach]

Anybody?

 

PM 4barlinkage. He isn't often on the Hub but he can assist.

[Hilton.]

PM 4barlinkage. He isn't often on the Hub but he can assist.

 

Thanks slick

[Cyclocross]

I had exactly the same problem in fitting an older IS standard XTR brake caliper to a newer post mount fork (SID Team). Tried various adaptors including the red KCNC like yours. In summary, I could not get any to fit properly for use with a 160mm rotor. They work fine with longer bolts and spacers to accommodate a 180/185mm rotor. I wanted to stay 160mm however, and had a trustworthy LBS do a little machining of one like yours and it worked fine for my 160mm rotor.

 

Ironically I spent longer getting it sorted than I spent using it as I subsequently upgraded to brakes with postmount, and the IS caliper brakes reverting to the IS fork it was originally used on (now on wifes bike) so adaptor no longer needed. Such is life.

[RockCoach]

 

 

Thanks slick

 

 

My ugly solution would be to fill up the gap with washers. But perhaps there is an alternative?

[Hilton.]

I had exactly the same problem in fitting an older IS standard XTR brake caliper to a newer post mount fork (SID Team). Tried various adaptors including the red KCNC like yours. In summary, I could not get any to fit properly for use with a 160mm rotor. They work fine with longer bolts and spacers to accommodate a 180/185mm rotor. I wanted to stay 160mm however, and had a trustworthy LBS do a little machining of one like yours and it worked fine for my 160mm rotor.

 

I'm considering doing this. I wonder if my LBS can do this for me. But it's probably easier / better to just grab a "fine-grit" file or rasp myself and round off the post mounts on the (Suntour) fork, rather than machining the adaptor. Both should work.

 

 

 

My ugly solution would be to fill up the gap with washers. But perhaps there is an alternative?

 

Hmm, well I considered doing something like this. I don't know the diameter of the bolts though. But more importantly, I don't think it'd be very stiff with a stack of washers

Edited August 15, 2012 by uoʇl!ʜ

[RockCoach]

Hilton, did you get sorted with this?