question about shimano sti

[Massimiliano Poletto]

Anyone use Shimano STI integrated brake/shift levers (say, Ultegra 6700 or similar) and long-reach side-pull breaks (like the Shimano BR-R650) with 28-30mm tires?

Unlike Campy and Tektro brake levers, I believe the Shimano ones don't have a quick-release mechanism. Is that true? Do you have trouble removing or inserting larger tires?

Thanks,

max

[Peter White]

STI levers don't have QRs. However, those calipers do, unlike recent campy calipers.

On my Rivendell I have tires measuring 29mm wide on Mavic Open Pro rims. The caliper's QR doesn't spread the pads enough to clear the tires, so I use the cable adjusters on the calipers as well. So between the QR and the cable adjuster I get plenty of spread for the tires.

PJW

Peter White Cycles

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Peter White

[littlecirclesvt.com :: mike beganyi]

I just moved to SRAM brake levers. No quick release... and I run those Shimano brakes.

Conti 4 season 28s clear fine with a bit of a tug. (Open Pro rim front, Aerohead OC rear).

Anything wider and I have to adjust the barrel on the brakes.

Debating putting an inline adjuster on next time I re-cable, as I can run 35mm cross tires on this bike.

-mb

[Massimiliano Poletto]

Thank you everyone for your input (much of it off-list).

Consensus:

- Shimano and SRAM brifters do not have a quick release mechanism. This is in contrast to Campagnolo brifters and to Tektro brake levers (which I use today).

- Shimano long-reach side-pulls (BR-R650, etc.) have a cam-actuated quick release mechanism (I am familiar with it since I own those and similar brakes), but it does not provide enough travel to clear a fully-inflated 28+mm tire. Ironically, recent Campagnolo calipers don't have a quick release.

- Two interesting ideas:

  - Use Campagnolo brifters with Shimano or SRAM calipers.

  - Mount a brake cable adjuster such as the (expensive!) Shimano SM-CB90.

Thanks again!

max

[Massimiliano Poletto]

Update from another friend: apparently Tektro R539 road calipers (47-57mm reach) have large enough QR travel to accommodate 35mm tires without requiring a QR on the brake lever. Not shabby!

[Rob Johnston]

Max,

                If those 47-57 Tektro calipers are like they were 10 years ago, they are flexible and, thus, brake less powerfully than the Shimano medium reach calipers (which are heavier/thicker and offer stronger stopping power.)

 

Rob

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