REVIEWS DEALS BIKESHOPS TRAILS

Bending seatstays under braking

752 Views 4 Replies 5 Participants Last post by dorsett, Dec 20, 2005

SpinWheelz

Discussion Starter · Dec 16, 2005

I got a sitch with my rear braking I'm not sure if I should be worried about or not. Here's the skinny:
- Bike: 1991 Trek 950 lugged steel frame
- Brake levers: Dia-Compe 287V road brake levers
- Brakes arms: Shimano Deore M510 v-brakes
- Brake pads: Kool-Stop dual compound MTB brake pads
- Wheel: 1991 Shimano Deore LX wheels

Here's the sitch - when I squeeze the brake levers, I notice that the seatstays bend ever so slightly outwards at the v-brake boss point. It's the darnest thing - I've never seen anything like this before. Is this normal, is this an issue with my seatstays, is this a matter of situating my brake pads, what?

If anyone can help shed some light on this and if there's any I can or even should do, it'd be great. Thanks a mil.

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duc135

· #2 · Dec 16, 2005

SpinWheelz said:
I got a sitch with my rear braking I'm not sure if I should be worried about or not. Here's the skinny:
- Bike: 1991 Trek 950 lugged steel frame
- Brake levers: Dia-Compe 287V road brake levers
- Brakes arms: Shimano Deore M510 v-brakes
- Brake pads: Kool-Stop dual compound MTB brake pads
- Wheel: 1991 Shimano Deore LX wheels

Here's the sitch - when I squeeze the brake levers, I notice that the seatstays bend ever so slightly outwards at the v-brake boss point. It's the darnest thing - I've never seen anything like this before. Is this normal, is this an issue with my seatstays, is this a matter of situating my brake pads, what?

If anyone can help shed some light on this and if there's any I can or even should do, it'd be great. Thanks a mil.

This is entirely normal. Many manufaturers produce brake boosters that prevent or reduce this effect.

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Dwayne

· #3 · Dec 16, 2005

duc135 said:
This is entirely normal. Many manufaturers produce brake boosters that prevent or reduce this effect.

Exactly what I was about to say. I used to run a brake booster on my steel frame because of the flex. Really stiffens things up. When I switched to Magura Racelines on it (when they first came out), a brake booster was almost required, the Maguras would bend the stays even more than cantilevers.

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rpet

· #4 · Dec 16, 2005

buy a $15 v-brake booster.

Or else don't worry about it, because you barely even need brakes in the NYC area...

I'd like to see more classic hardtails around Blue Mountain; get that thing running!

-rob in Brooklyn

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dorsett

· #5 · Dec 20, 2005

That flex adds a bit of modulation. Hell if it bothers you make a brace, You well get a stronger brake.I know when I used rim brakes thats what I did.

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