Does anybody know is you can convert avid bb7 mtb calipers to a bb7 road calipers? As far as I know the only difference is cable pull.

EBB Question, for all of the mechanics

I'm in the next few weeks be putting together a bike with an EBB,

I presume that I loosen right off the pinch bolts. This frame has a shell with a split in it, and two fasteners that tighten the shell to hold the eccentric in place.

After that, coat the outside of the eccentric unit in grease (alloy eccentric into steel frame)

Than carefully fit the shell into the frame, torque up fasteners, then fit my BB of choice after that,

once I've then fitted the rest of the "drivetrain" then adjust the eccentric unit and torque up fasteners finally??

About right??

sounds right to me.

I'd be careful to only grease the parts of the shell inserts that contact the frame (I think those inserts are relieved?) - or at least NOT to grease near the point the shell bolts contact the insert.

Also, I've seen some builders use a grinder to put a point on the bolts (theory being it bites in to the alloy shell and holds it better). I'm not convinced, and would go for a bolt with an angled (or flat) contact that's been abraded.

This frame doesn't use bolts sticking into the shell, instead it uses the bolts to pinch the shell closed (the bottom of the frames shell has a gap in it)

Ok - same as the Ventana I had then. Mine was ok, but slipped occasionally. It might take some experimenting with carbon prep / friction paste to get it perfect.

musket wrote:Ok - same as the Ventana I had then. Mine was ok, but slipped occasionally. It might take some experimenting with carbon prep / friction paste to get it perfect.

Cheers for that I hadn't thought of using friction paste instead, thanks

Scotty wrote:sounds right to me.

Cheers

I just like to ask, as it's easier to ask a dumb question first rather than ask how to fix what I've buggered up

For what its worth I never had any EBB slippage when I had the Curtlo. Seemed a pretty reasonable design compared to other EBB designs.

Nick_K wrote:For what its worth I never had any EBB slippage when I had the Curtlo. Seemed a pretty reasonable design compared to other EBB designs.

cool as, lets face it you'll have put more power through that frame than I will ever be able to with my twiddle gear

Sounds like a better design than the Raleigh/Avanti one with the grub screws, but then again I never had slippage issues with mine. When I pulled mine apart the first time, I noticed it had been assembled with white (lithium?) grease. I reassembled just using marine grease (fairly liberally I might add), seemed fine. Ditto with me on the power front too though.

Oh yeah and the disclaimer: I aint no bike mechanic as Im sure you know

Oh yeah, just one other thing I used to practise with mine when setting it up, was to have the BB set in the top 180 degrees of the eccentric circle. That way if it slipped under hard pedalling, it would only be trying to make the chain tighter, whereas if it was in the lower 180 degrees, slippage would make it looser. Make sense?

That's a very good tip Dents.

Mine slipped a bit, but was in an alloy frame (and jumped / dropped / ridden fairly hard) so may have had a little less purchase.

You might not be a bike mechanic, but I still respect what you have to say

what you say re: setting it in the "upper part of the 180degree's" makes sense, cheers

musket wrote:
Mine slipped a bit, but was in an alloy frame (and jumped / dropped / ridden fairly hard) so may have had a little less purchase.

Anyone who has ridden with me, knows that "hard riding" and "jumps / drops" really aren't that likely on a rigid 29er