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PostPosted: Sun Sep 16, 2012 4:05 am 
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Location: Bay Area
Having been fortunate enough to have access to the required Avid Bearing Replacement tool I decided to replace the VERY seized up bearings in my Avid Arch Supremes.

The bearings are 688HZZ 8mm x 16mm x 5mm

8mm ID
16mm OD
5mm thick

There are 2 bearings per brake arm so a total of eight bearings are required.

Here are the brakes, one of the new bearings and the bearing tool.

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The bearings are actually housed in a removable bearing sleeve which is removed with the special Avid bearing tool:

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Once the bearing sleeve is removed each bearing must be tapped out from the inside out. There is a short 8mm ID spacer located inside the bearing sleeve between the inner surfaces of teh two bearings. It must be nudged a little out of place in order to be able to tap out the old bearings:

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Then place the bearing housing in a crescent wrench:

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Then tap out the bottom bearing with a hex socket or something similar:

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To tap out the second bearing I put the bearing sleeve the hex socket and used a 17mm box wrench on top of the sleeve.

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A few firm taps and the second bearing was out. You can see the little 8mm spacer here too.

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Repeat this 3 more times for the other brake arms and it's time to put in the new bearings.

To install the new bearings I made a little bearing press from an 8mm stem bolt and some wedges. I threaded the wedge on backwards so I could rest the new bearing against the flat surface of the wedge.

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Then the bearing:

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then the spacer:

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then the bearing sleeve:

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Then a second wedge or an 8mm nut if you have one:

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Then tighten the whole stack down gently:

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until the bearing is flush:

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tada:

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After doing one bearing and determining that the flat surface of the wedges were applying some undue pressure on the inner bearing surface I decided to use some washers that would transfer all compression forces to the outer bearing race:

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I think this provides a much gentler compression and the bearing spun absolutely smoothly after this slight modification.

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Bearing sleeves ready to be reinstalled into the brake arms:

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Freshly serviced Avid Arch Supremes ready for riding.

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PostPosted: Tue Sep 18, 2012 10:07 am 
Gold Trader | rBoTM Winner
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Joined: Thu Jan 03, 2008 3:10 pm
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Location: Froggie
very nice job 8)

luckily , my set of supreme and another one of extreme have OK bearings :lol:

But I had an old cousin turn and machine new stops in alu for the springs as the initial ones in plastic were broken :idea:

best v brakes on earth :idea: 8)


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PostPosted: Tue Sep 18, 2012 9:13 pm 
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Joined: Wed Jul 08, 2009 9:36 pm
Posts: 360
Location: Sweden
Great DIY :D


bduc61:
Did he make some more of them by chance? One of mine also broke.
I´d be interested in buying ;)
I´m bummed that I can´t use them on my racelite as the Marz fork can´t take them...
TIA
/J


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PostPosted: Thu Sep 20, 2012 10:37 am 
Gold Trader | rBoTM Winner
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Joined: Thu Jan 03, 2008 3:10 pm
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Location: Froggie
bonty98 wrote:
Great DIY :D


bduc61:
Did he make some more of them by chance? One of mine also broke.
I´d be interested in buying ;)
I´m bummed that I can´t use them on my racelite as the Marz fork can´t take them...
TIA
/J


don't think so but there maybe a "trial" one left that could be used

bruno


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PostPosted: Thu Sep 20, 2012 11:21 am 
Mr Benn
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This is really useful. Thanks for sharing.

Now, can you lend the tool out...? :wink:


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PostPosted: Thu Sep 20, 2012 3:34 pm 
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Joined: Tue Oct 06, 2009 5:51 pm
Posts: 733
Location: Bay Area
Augustus wrote:
This is really useful. Thanks for sharing.

Now, can you lend the tool out...? :wink:


Unfortunately... no. It's not my tool. However, I think the bearing sleeves could be removed with a socket or pliers, and if you're gentle and use a rag to protect the aluminum then it might work without scratching them too much.


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