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Old 04-05-14, 11:43 AM   #1
MidnightAlchemy
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Any downside to brake pads all the way up?

Converting 27" to 700c and wanted to replace the old calipers with new dual pivots. Best option I could find was a pair of Tektro R559s with a 55-73mm reach. My best measurements say I only need the 55mm reach on these so the brake pads are pushed all the way up in the brace. Is there a downside to this? It looks kind of lame but fits.

I know the Tektro R539 exists but I've had trouble finding them in a nutted bolt version and I don't really want to drill out for recessed.
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Old 04-05-14, 12:08 PM   #2
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No, the slot has a length, and anywhere along it is within the design parameters. As an old professor of mine used to say (paraphrased) You paid for the entire slot, and weren't offered a discount for not using it, so go ahead and use it.

BTW- the higher the shoe is in the slot, the greater the leverage of the brake, so to a small extent top of the slot is better than bottom of the slot. Of course that assumes that you're not kidding yourself and the shoe is centered on the rim the same way it would be if you had more room.
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Old 04-06-14, 04:37 PM   #3
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And Harris has nutted Tektro R539's, claimed to be in stock.

Brakes - Harris Cyclery bicycle shop - West Newton, Massachusetts
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Old 04-06-14, 05:46 PM   #4
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the higher the shoe is in the slot, the greater the leverage of the brake, so to a small extent top of the slot is better than bottom of the slot.
IANAEngineer but I'm pretty sure the correct statement is "the closer the shoe is to the pivots, the greater the leverage." 55mm at the top of a long caliper offers no better leverage than 55mm at the middle of a medium-length caliper.
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Old 04-06-14, 05:51 PM   #5
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Quote:
Originally Posted by peterw_diy View Post
IANAEngineer but I'm pretty sure the correct statement is "the closer the shoe is to the pivots, the greater the leverage." 55mm at the top of a long caliper offers no better leverage than 55mm at the middle of a medium-length caliper.
Yes, you're correct in a general sense. But we're talking about the one caliper he has, so my statement is equally true in the specific case.
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Old 04-06-14, 05:52 PM   #6
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Quote:
Originally Posted by peterw_diy View Post
IANAEngineer but I'm pretty sure the correct statement is "the closer the shoe is to the pivots, the greater the leverage." 55mm at the top of a long caliper offers no better leverage than 55mm at the middle of a medium-length caliper.
Correct, but 55 mm at the top of a long reach caliper offers better leverage than 73 mm at the bottom of the same caliper.
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Old 04-07-14, 04:29 AM   #7
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And the actuating arm will be longer on the long reach brake to maintain the same leverage ratio, so you're better off with the pads at the top of the long reach, than at the bottom of the short reach, calliper. That is, if it's power you're after.

- joel
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