Swapping 185 stock rotors with 180mm ashima- Mtbr.com
Results 1 to 15 of 15
  1. #1
    Schwizzle
    Reputation:
    Join Date
    Apr 2006
    Posts
    87

    Swapping 185 stock rotors with 180mm ashima

    Have a 2011 scott scale and looking to go ashima windcutter 180 front rotor but my stock rotor is a 185. Can I swap these without any modification? Seems like all the lightweight lower cost rotors only come in 180's

  2. #2
    ups and downs
    Reputation: rockyuphill's Avatar
    Join Date
    Nov 2004
    Posts
    15,569
    You'd need to find the correct caliper mounts for 180mm.
    I'm a member of NSMBA and IMBA Canada

  3. #3
    Plays with tools
    Reputation: customfab's Avatar
    Join Date
    Jun 2008
    Posts
    4,633
    personally I wouldn't worry about changing the adaptor. You are down sizing by 2.5 mm, I would just take the Avid CPS hardware out of there and put the correct amount of spacers to dial it in. But since this is the WW forum you should probably get an adaptor other than an avid that is set up to run 180.

  4. #4
    mtbr member
    Reputation: Dictatorsaurus's Avatar
    Join Date
    Sep 2009
    Posts
    2,664
    I want to do the same. I read a while ago that you can remove one of the Avid CPS washers. Not sure which one will give you perfect contact.

  5. #5
    mtbr member
    Reputation: raganwald's Avatar
    Join Date
    Feb 2011
    Posts
    913
    Swap the adaptors, and while you're at it you should look into blinging your WW project with adaptors from http://northshorebillet.com.

  6. #6
    mtbr member
    Reputation: Dictatorsaurus's Avatar
    Join Date
    Sep 2009
    Posts
    2,664
    Just installed 180mm rotor instead of my avid 185mm. Just remove the dome shaped washers from the top and bottom to get proper clearance.

  7. #7
    Plays with tools
    Reputation: customfab's Avatar
    Join Date
    Jun 2008
    Posts
    4,633
    Quote Originally Posted by Dictatorsaurus View Post
    Just installed 180mm rotor instead of my avid 185mm. Just remove the dome shaped washers from the top and bottom to get proper clearance.
    So what are you going to do when the braking forces crush that concave washer and your caliper becomes loose and rattles around causing you to crash?

  8. #8
    mtbr member
    Reputation: Dictatorsaurus's Avatar
    Join Date
    Sep 2009
    Posts
    2,664
    Quote Originally Posted by customfab View Post
    So what are you going to do when the braking forces crush that concave washer and your caliper becomes loose and rattles around causing you to crash?
    You had the washer collapse before?

  9. #9
    Plays with tools
    Reputation: customfab's Avatar
    Join Date
    Jun 2008
    Posts
    4,633
    Quote Originally Posted by Dictatorsaurus View Post
    You had the washer collapse before?
    Personally, no. I know better than to set brakes up like that. However back in the V- brake days I had a bike come into the shop with the washers out of order and the concave washer had crumbled into chunks. Bottom line, to set your brakes up like that is asking for trouble and a hack job.

  10. #10
    mtbr member
    Reputation: Dictatorsaurus's Avatar
    Join Date
    Sep 2009
    Posts
    2,664
    Quote Originally Posted by customfab View Post
    Personally, no. I know better than to set brakes up like that. However back in the V- brake days I had a bike come into the shop with the washers out of order and the concave washer had crumbled into chunks. Bottom line, to set your brakes up like that is asking for trouble and a hack job.
    The washer is concave inwards.

  11. #11
    Plays with tools
    Reputation: customfab's Avatar
    Join Date
    Jun 2008
    Posts
    4,633
    Quote Originally Posted by Dictatorsaurus View Post
    The washer is concave inwards.
    It doesn't matter, your putting all of the pressure on that little lip and it will fail.

  12. #12
    mtbr member
    Reputation: Dictatorsaurus's Avatar
    Join Date
    Sep 2009
    Posts
    2,664
    Quote Originally Posted by customfab View Post
    It doesn't matter, your putting all of the pressure on that little lip and it will fail.
    I know a bunch of people using the same setup with no issues.

    Your experience with v-brakes has nothing to do with disc brakes.

  13. #13
    ups and downs
    Reputation: rockyuphill's Avatar
    Join Date
    Nov 2004
    Posts
    15,569
    Not likely to be an issue. Here's a cup washer that I just tried to squash in a vice, leaving just 2/3 of the washer in the jaws. With all the torque I could apply with the 8" handle on the vice, I managed about 0.5mm of deformation of the cup edge. If I would have got the whole washer in the jaws it would likely have been less. But no shattering or exploding.
    Attached Thumbnails Attached Thumbnails Swapping 185 stock rotors with 180mm ashima-2011_0724new0001.jpg  

    I'm a member of NSMBA and IMBA Canada

  14. #14
    mtbr member
    Reputation:
    Join Date
    Feb 2010
    Posts
    1,825
    Seeing as though this is the weight weenies forum, just get some suitable Ti washers (I got some from toronto cycles). Stack as many washers as you need to get perfect tracking of the caliper on the braking surface. Using the concave washer is probably OK but it does seem slightly dodgy compared to just using some suitably sized washers.

  15. #15
    Schwizzle
    Reputation:
    Join Date
    Apr 2006
    Posts
    87
    ok, thanks for all the feedback and opinions.....much appreciated

Similar Threads

  1. Ashima Aro-08 Rotors
    By djonesax in forum Brake Time
    Replies: 1
    Last Post: 07-13-2011, 02:05 PM
  2. Replies: 5
    Last Post: 02-19-2011, 09:23 PM
  3. Origin 8 Ashima Rotors
    By tailwaters in forum Brake Time
    Replies: 0
    Last Post: 07-04-2010, 01:03 PM
  4. ashima rotors with semi-metallic pads?
    By foresterxt in forum Brake Time
    Replies: 1
    Last Post: 04-16-2010, 06:53 PM
  5. Ashima Brake rotors ARO-08 160mm & 140mm
    By Cheers! in forum Weight Weenies
    Replies: 74
    Last Post: 11-03-2008, 09:15 AM

Members who have read this thread: 0

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •  

THE SITE

ABOUT MTBR

VISIT US AT

© Copyright 2020 VerticalScope Inc. All rights reserved.