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 Post subject: Extending caliper reach?
PostPosted: Thu Jul 19, 2012 8:39 pm 
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Joined: Wed Jun 09, 2010 10:44 am
Posts: 293
Any suggestions for getting about 2mm extra reach from my front DA 7900 calipers?

I am loathed to have to replace them for a BR650 (57mm drop), just for the sake of 2mm, but can't find a way out.

I tried flipping the DA pads around L/R because they kinda point upwards when normally installed, but this didnt really work (top of pad just off the rim, not on the tyre, but with a bit of wear it would be). Theoretically I could attempt to dremel/drill out 2mm from the fork dropouts but that's a bit scary!

Maybe a different shoe would give me just that extra bit of drop?

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PostPosted: Thu Jul 19, 2012 8:55 pm 
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Joined: Mon Jul 26, 2004 8:57 pm
Posts: 787
Location: Ireland
How about drilling 2mm from the caliper pad holder holes?


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Posted: Thu Jul 19, 2012 8:55 pm 


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PostPosted: Thu Jul 19, 2012 8:56 pm 
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Joined: Mon Jul 26, 2004 8:57 pm
Posts: 787
Location: Ireland
How about drilling 2mm from the caliper pad holder holes?


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PostPosted: Thu Jul 19, 2012 8:57 pm 
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Joined: Wed Jun 09, 2010 10:44 am
Posts: 293
They only have about 3mm from hole to bottom edge.

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PostPosted: Thu Jul 19, 2012 9:08 pm 
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Joined: Wed Jun 09, 2010 10:44 am
Posts: 293
Now something like this would work...

http://www.imperialsupplies.com/item/0765320" onclick="window.open(this.href);return false;

I can angle the bolt downwards with this get just about a 2mm drop, then use the toe-in on the shoe to level it up with the rim. Now to find them in the uk...

Edit: Turns out they are not so difficult to make with an inner tube nut and a dremel :)

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PostPosted: Thu Jul 19, 2012 11:35 pm 
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Joined: Wed Jun 09, 2010 10:44 am
Posts: 293
So after about 90 mins dremelling, fitting those brake a shoes just simply refuse to toe in at such an angle, and so a. BR 650 now looks like the only realistic solution.

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PostPosted: Fri Jul 20, 2012 12:14 am 
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Joined: Sun Jul 10, 2011 9:03 am
Posts: 292
Drop bolt?
http://sheldonbrown.com/dpdropbolt.html" onclick="window.open(this.href);return false;

No. Forget I mentioned it. :oops:

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PostPosted: Fri Jul 20, 2012 12:29 am 
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Joined: Fri Feb 17, 2012 5:33 pm
Posts: 47
Location: Louisiana USA
You can try something that worked for me when converting a frame designed for 27 inch wheels to 700c.

All I did was shave 2mm from the top edge of the brake pad where it would contact the rim. Leave the part inside the shoe holder intact.

You probably won't even notice the decrease in braking force due to the decrease in contact area.


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PostPosted: Fri Jul 20, 2012 12:34 am 
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Joined: Wed Jun 09, 2010 10:44 am
Posts: 293
Seems there no one selling them anymore, and not sure how they perform A specially designed shoe would be perfect, but doesnt look like they exist.

http://www.bentrideronline.com/messageb ... hp?t=54096" onclick="window.open(this.href);return false;

sums it up pretty nicely.

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PostPosted: Fri Jul 20, 2012 12:36 am 
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Joined: Wed Jun 09, 2010 10:44 am
Posts: 293
2mm off a 7900 pad would be nearly half of it.

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PostPosted: Fri Jul 20, 2012 12:53 am 
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Joined: Fri Feb 17, 2012 5:33 pm
Posts: 47
Location: Louisiana USA
The pads I have (Blue Reynolds) are 7.5 mm wide, so 2 mm is less than a third, closer to a fourth.

Older pads (like from sidepulls) are about 11 mm so 2 mm from that would be negligible indeed.


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Posted: Fri Jul 20, 2012 12:53 am 


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PostPosted: Fri Jul 20, 2012 1:44 am 
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Shop Owner

Joined: Sat Jun 13, 2009 4:02 am
Posts: 1980
Location: NoVA/DC
this is what you need but it looks like theyre not around anymore. im still looking.
Image


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