BB7 Brake Caliper dimensions??

[marc.knuckle]

bit of a technical question so i will try my best.

when my father-in-law and myself attached the kit to a mongose mountain bike there was much fiddling and messing to get it to fit but we got there.

one small casualty is the rear brake caliper is very close to the hub in the wheel. when i try to adjust the allen key that moves the inner brake pad closer to the disc i cant get to it with an allen key. the only way we could do it is to take the nut out and file slots into the very small amount that sticks out so we can use a thin screwdriver to push the bolt tighter. hopefully that makes sense.

because of this messing my f-i-l said he'd seen some calipers with a adjuster knob on but we cant see that knob to buy on it's own so i was looking at the bb7 calipers (wouldnt need the discs i dont think) but was worried about clearance.

so... does anyone have experience with this problem or have actually measurements of the distance from the disc surface to the edge of that adjuster knob?

thanks guys

 

[Deleted member 4366]

Is it not possible to undo the two caliper retainingng screws, turn the adjuster, and screw the caliper back in place. Should only take a minute.

Another solution is to fit a bigger disk to move the caliper out further where you can get at it.

 

[Oxygen Bicycles]

As Dave suggested a bigger disc would help as it would move the calliper up above the motor shell, just like on the pictures below. We use BB7 on our bikes so once we have our bike back from a photographer I will measure the BB7 for you and could let you know

[url]http://oxygenbicycles.com/Images/Dapu-motor-3.jpg[/URL]
[url]http://oxygenbicycles.com/Images/Dapu-motor-4.jpg[/URL]

 

[marc.knuckle]

cheers guys.

i guess either solution is better than the way i currently do it.

thanks also for the details when you can get them for me but also, is there a cheap way of getting bb7's with those bigger discs or is it better to get the calipers say off ebay then get seperate discs?

thanks again guys.

 

[Deleted member 4366]

You only have to buy a disk rotor and the adapter to lift the caliper higher. Assuming that you're going from 160mm to 180mm:
Shimano Rear IS Mount to Post Mount 180mm Bicycle Bike Disc Brake Adapter | eBay
180mm rotor in Disc Brake Components | eBay

 

[marc.knuckle]

cheers d8veh

so these could all go together?

New Avid BB7 MTN Mountain Bike Mechanical Disc Brakes (F+R) | eBay

Shimano Rear IS Mount to Post Mount 180mm Bicycle Bike Disc Brake Adapter | eBay

180mm (7 Inch) Disc Brake Rotor for SHIMANO 6 Bolt IS | eBay

 

[Deleted member 4366]

Yes. If you're going to buy those calipers, you might not need the adapter because you get some with them.

 

[marc.knuckle]

cheers.

unfortunately the post doesnt state whether they are adapters to allow 180mm discs so i have asked the seller that question to confirm.

thanks so far

 

[marc.knuckle]

hi d8veh i got the reply to the question and the seller said the adapters were for only 160mm.

i am looking at the sets but they are all inc 160mm so i will need to buy separate callipers, rotors and adapters i think.

do you think it worth going to 203mm or would 185mm give sufficient clearance compared to the 160mm? that should translate to 12.5mm extra height i guess.

 

[Deleted member 4366]

All my hub-motors have 180mm discs and I've never had a problem. 185mm would also be OK, but I think 203mm won't look right and you'll struggle to find a big enough adapter.

 

[marc.knuckle]

thanks mate, i have ordered the callipers and separate 185mm discs and mounts, all in, £82.