AVID disc - Road vs MTB?

Zebee Johnstone said:

I see on Dean Woods Direct that the Avid BB7 disk brake comes in a
road and MTB version.

What's the difference?

Different mechanical advantages.

The BB7 road will work with drop-bar levers (or old canti levers) while
the MTB version requires the greater mechanical advantage of direct-pull
brake levers.

Cheers

Joel

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lever pull?

Dave H

"Zebee Johnstone" <[email hidden]> wrote in message
news:[email hidden]...

Quoted message said:

I see on Dean Woods Direct that the Avid BB7 disk brake comes in a
road and MTB version.

What's the difference?

Zebee

In aus.bicycle on 17 Jun 2007 09:31:50 GMT

Joel Mayes said:

Zebee Johnstone said:

I see on Dean Woods Direct that the Avid BB7 disk brake comes in a
road and MTB version.

What's the difference?

Different mechanical advantages.

The BB7 road will work with drop-bar levers (or old canti levers) while
the MTB version requires the greater mechanical advantage of direct-pull
brake levers.

I suspected it might be a lever thing. as the 'bent has Avid
cantilevers that can't really be called "old" I guess I need the MTB
version.

And no doubt some new cable. I presume I just need new inners, and
the outers stay the same? Just a lot of cable running down closer to
the hub?

Zebee

Zebee Johnstone said:

And no doubt some new cable. I presume I just need new inners, and
the outers stay the same? Just a lot of cable running down closer to
the hub?

You're better off doing the outers at the same time. It's about $10/m from
memory and you'll need less than that, and that way you've got the right
length. Unlike hydro systems (like your silly motorised bikes), cable
brakes have friction and suffer when the cable goes through bends. Keeping
the cable at the right length has noticeable effects on the braking.

If you're playing upgrades then I'd highly recommend replacing the outer
and inner, and if you want to borrow a set of cable cutters, sing out. Oh,
and I've forgotten to post that reflective tape, so I'll have a look for
that tomorrow.

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Dave Hughes | [email hidden]
Frankly, your argument wouldn't float were the sea composed of mercury.
- Biff

Zebee Johnstone said:

In aus.bicycle on 17 Jun 2007 09:31:50 GMT

Joel Mayes said:

Zebee Johnstone said:

I see on Dean Woods Direct that the Avid BB7 disk brake comes in a
road and MTB version.

What's the difference?

Different mechanical advantages.

The BB7 road will work with drop-bar levers (or old canti levers) while
the MTB version requires the greater mechanical advantage of direct-pull
brake levers.

I suspected it might be a lever thing. as the 'bent has Avid
cantilevers that can't really be called "old" I guess I need the MTB
version.

I tink I meant to type old-style i.e. traditional cantis with a straddle
cable or yoke, not direct-pull cantis (V-Brakes). I'd say you probably
need the road version, but without seeing your levers...

Quoted message said:

And no doubt some new cable. I presume I just need new inners, and
the outers stay the same? Just a lot of cable running down closer to
the hub?

Zebee

It worth replacing the outer if it hasn't been done in a while, or if
the inner is dirty or rusty in any way. Also if the outer came with the
bike it's a good bet some sections are not the ideal length look at the
ends of the outer and see if it is damaged where the cable leaves the
stop/brake/mech/whatever. if there's a sharp kink there the cable is
slightly to short.

Cheers

Joel

--
Human Powered Cycles | High quality servicing and repairs
[email hidden] | Affordable second hand bikes
(03) 9029 6504 | Bicycle reuse centre
www.humanpowered.com.au | Mechanical and on-road training and instruction