[fishy]

I want to take advantage of the 20% discount in Cambria so am looking at some Avid Mechs.

Can someone please let me know if there are any differences between these 2 Avid BB7 mechanical disc brakes?

http://www.cambriabike.com/shopexd.asp?id=12881
http://www.cambriabike.com/shopexd.asp?id=19388

Besides the colour (one red, and one grey) of the knob of course. The year is supposed to be the same, 2005.

I think I am missing something, but I have no idea what!

Thanks!

 

[shiggy]

Rotor shape and only rotor shape (it is mentioned in the text).

the knob is grey because it is a black and white pic.

 

[fishy]

"the knob is grey because it is a black and white pic."

DOH! ;-)

Thanks Shiggy.

Quick question - any differences between that? In other words, which one should I buy? I will be using it for cross country. Thanks!

Newbie disc user.

 

[shiggy]

Get the round rotors

 

[RJend]

The b/w BB7 is the older version that Avid designates as "type N". The newer, colored version is a "type F". If you look closely at the b/w photo, you can see the round "ear" of the pad spreader clip. This ear, logo placement, and other internal changes distinguish the two brake types. I would go with the newer type F brake.

 

[shiggy]

The b/w BB7 is the older version that Avid designates as "type N". The newer, colored version is a "type F". If you look closely at the b/w photo, you can see the round "ear" of the pad spreader clip. This ear, logo placement, and other internal changes distinguish the two brake types. I would go with the newer type F brake.

Sorry, no. Both calipers are the newer type F.

This is the pic you say is a type N (it is the type F)

Below is the older type N. I prefer the older design.

Check the Service Guide for details: https://www.sram.com/_media/techdocs/Avid BB7 Overhaul Guide.pdf

 

[AndrewTO]

The b/w BB7 is the older version that Avid designates as "type N". The newer, colored version is a "type F". If you look closely at the b/w photo, you can see the round "ear" of the pad spreader clip. This ear, logo placement, and other internal changes distinguish the two brake types. I would go with the newer type F brake.

Sorry man, but both of the link's show the newer Type N caliper's. Double-check the shape of the caliper and arm. Also, the b/w photo doesn't have the logo on the side of the arm, nor does it have the same shaping for where the cable is fixed to the caliper itself.

 

[RJend]

Sorry man, but both of the link's show the newer Type N caliper's. Double-check the shape of the caliper and arm. Also, the b/w photo doesn't have the logo on the side of the arm, nor does it have the same shaping for where the cable is fixed to the caliper itself.

You're right - I stand corrected. I guess I was confused by the ear on the seperator thinking it appeared only on type N and not nowing it was for early type F.

Why is the round rotor prefered?

 

[AndrewTO]

You're right - I stand corrected. I guess I was confused by the ear on the seperator thinking it appeared only on type N and not nowing it was for early type F.

Why is the round rotor prefered?

The theory/finding's show that because the rotor's "width" (and thus, surface area) varies, this causes a pulsating effect. Some people have also found that these (not round) rotor's also contribute to various noise issue's. Neither are a desireable effect.

Kinda funny when you think about it - when's the last time you saw a rotor for a car/truck or motorcycle NOT round? I don't know why they even bothered with "wavy" and "polygon" rotor's, really. Oh yeah - they look cool. Meh, if that's your thing....

I don't speak from any personal experience with this - all the rotor's I have are round. This is just from what i've read here on MTBR.

 

[Pivvay]

Kinda funny when you think about it - when's the last time you saw a rotor for a car/truck or motorcycle NOT round? I don't know why they even bothered with "wavy" and "polygon" rotor's, really. Oh yeah - they look cool. Meh, if that's your thing....

I don't speak from any personal experience with this - all the rotor's I have are round. This is just from what i've read here on MTBR.

There are some "gofast" bits for motorcycles and cars that have non-round rotors but they're always pricey and of questionable gain (except maybe some weight).

 

[shiggy]

You're right - I stand corrected. I guess I was confused by the ear on the seperator thinking it appeared only on type N and not nowing it was for early type F.

Why is the round rotor prefered?

The older type N calipers did not use the pad spring clip at all. Magnets held the pads to the pressure foot(s).

Avid's non-round rotors have been linked to howling and stutter feel. The round rotors worked better. I use Galfer wavey rotors and prefer them to round Avids.