Bicycle TutorBicycle Tutor

Show off your bike!

Post Reply 

Disc brake adaptor mounts

Related video tutorials:
Author Message
mbuttie Offline
New Member

Isle of Wight, UK
Posts: 2
Joined: Sep 2012
Post: #1
Disc brake adaptor mounts
Hello,
I will try to be as concise as possible with my problem.

I have changed the Shimano Alvine hyd disc calipers on my Cube Hooper to Avid BB7 cable operated calipers as part of a project to go from straight to drop handlebars. Rotors remain the same at 160mm front and rear.

Issue is with the Shimano adaptor mounts that were on the bike and those that came with the Avids (20mm IS) - in short which to use.

Not having done this job before I made an assumption (ho, ho, ho) and, starting with the rear caliper, removed the standard Shimano adaptor mount and fitted the BB7 using the 20mm IS adaptor Avid supplied it with - and it seemed(s) to have set up fine.

Problem was when I applied the same process to the front caliper - the BB7's straight pad tab clashed badly with the 20mm IS adaptor to an extent that it would not allow caliper to 'cover' the rotor in terms of pad / rotor depth. I solved the problem by reverting back to the Shimano adaptor mount which does have a different profile and allows the BB7 to sit over the rotor.

So question is - does it sound correct that I am having to use two different profile adaptors with the same calipers and rotors?
Sep 10, 2012 05:47 AM
Find all posts by this user Quote this message in a reply
nfmisso Offline
Veteran Member

San Jose, CA
Posts: 2,413
Joined: Jul 2010
Post: #2
RE: Disc brake adaptor mounts
different adapters are not unusual.

Given your comfort level, you should have anything brake related checked out by a competent mechanic.

Nigel
Sep 10, 2012 02:31 PM
Find all posts by this user Quote this message in a reply
RobAR Offline
Veteran Member

Mountain Home, AR
Posts: 725
Joined: Sep 2010
Post: #3
RE: Disc brake adaptor mounts
Your question is not uncommon. You just got lucky on the rear adaptor. The front requires more thought but, you can do it. To be honest... even after having served as a bike mech for a quarter of a Century, I still have to stop and think.
I do think that Shimano has the superior calipers but I like SRAMs (Avid) mounting system better. When you start mixing the two, it gets confusing but can be done. My bet is that you already have the parts that you need. You just need to assemble everything in a Frankenbike manner. If you can spec which fork you have - I might have more info.

Wheelies don't pop themselves. (from a QBP fortune cookie)
Sep 10, 2012 07:19 PM
Visit this user's website Find all posts by this user Quote this message in a reply
mbuttie Offline
New Member

Isle of Wight, UK
Posts: 2
Joined: Sep 2012
Post: #4
RE: Disc brake adaptor mounts
(Sep 10, 2012 07:19 PM)RobAR Wrote:  Your question is not uncommon. You just got lucky on the rear adaptor. The front requires more thought but, you can do it. To be honest... even after having served as a bike mech for a quarter of a Century, I still have to stop and think.
I do think that Shimano has the superior calipers but I like SRAMs (Avid) mounting system better. When you start mixing the two, it gets confusing but can be done. My bet is that you already have the parts that you need. You just need to assemble everything in a Frankenbike manner. If you can spec which fork you have - I might have more info.


Cheers for the input guys.
I returned to the workshop last night (I needed the bike for the daily commute) and applied the investigative techniques of Sherlock Holmes.

I compared the adaptor profile options against how the bike is set, Shimano adaptor on front forks, Avid 20mm IS on rear seatstay (this set-up seems to work, I have full pad / rotor cover and no pad tab / adaptor clashing) with the option of swapping adaptors.

What I know is that the Avid adaptor on the front (standard Cube Hooper / Editor IS fork) will not work, it seems too deep, pad / rotor cover is 60% at best.

Swapping out the rear Avid for the Shimano will not work as the shallow Shimano allows the caliper to clash with the rotor - I get too much cover!

So, up-shot is that unless I have missed something (quite possible!) using two different adaptors works. It looks right vis-a-vis pad / rotor alignment, I have adjusted the brakes - they work very well and I rode the bike to work today and did not embarass or damage myself, other life forms or bike.

Just seems odd that two identical adaptors came off, but two different ones were needed to go back.

One of lifes great mysteries I supose.
Sep 11, 2012 02:08 AM
Find all posts by this user Quote this message in a reply
Post Reply 


Possibly Related Threads...
Thread: Author Replies: Views: Last Post
  At Brake Lever on Handlebars... Adjuster JanJ 6 128 Today 10:50 AM
Last Post: nfmisso
  Tacx brake shoe alignment tool ?? !TREK4ME! 1 344 Nov 27, 2014 01:09 PM
Last Post: cny-man
  Mafac Racer Brake Date Codes? JanJ 5 262 Nov 25, 2014 07:19 PM
Last Post: JanJ
  Crooked Piston in Shimano R-R505 Disc Brakes Art in Broadview 0 199 Nov 20, 2014 09:50 PM
Last Post: Art in Broadview
  Different brake pads for different rims? !TREK4ME! 10 375 Nov 20, 2014 08:55 PM
Last Post: !TREK4ME!
  No name disc brakes(knockoff's) !TREK4ME! 4 278 Nov 18, 2014 04:01 PM
Last Post: !TREK4ME!
  Brake levers don't match handlebars DustyRoads 1 365 Nov 2, 2014 09:09 AM
Last Post: nfmisso
  How do you adjust the brake cant on old caliper bikes? Chimoshi 3 535 Oct 29, 2014 09:07 AM
Last Post: Chimoshi
  The brake has snapped off bike trilla_ruben 3 558 Oct 14, 2014 05:46 AM
Last Post: cny-man
  Front Brake Line Coming out of its Mount a tub of adam 9 1,031 Sep 9, 2014 01:54 PM
Last Post: cny-man

Forum Jump:


RSS Forum RSS Feeds / Powered by MyBB

ISSN 1918-3445 © Copyright 2007-2010 Bicycle Tutor / Privacy Policy

feed