Transmission database - for all your crank / bb / bottom bracket questions

I want to run SRAM S100 1.1 on a Steamroller. I believe the correct BB to use is Truvativ Powerspline, but what width do I need? 108mm? Rear hub will be 120mm naturally.

Chain reaction cycles say 108 ( http://www.chainreactioncycles.com/Models.aspx?ModelID=31622 ). The tiny writing on page 15 of this ( http://www.sram.com/sites/default/files/techdocs/my10-truvativ-tech-manual-rev_1.pdf ), and the extended notes on the 2nd item here ( http://www.shopwiki.com/l/TruVativ-Powerspline-Bottom-Bracket-68x108-68x108-Black ) say that will give you a 46mm chainline.

As the chainring is already on the inside of the spider you could add washers and longer chainring bolts to move the chain-line back to a normal 42mm, or pick hubs with a 46mm chainline.

I'm looking for an affordable or cheap BB and cranks combo with a chainline of 45mm for single-speed (Formula and Dicta) use.

I've been told Sugino RD2 and 103mm JIS BB would do the trick, but I'd rather not spend even that much on the cranks. I was thinking of the cheap as chips Lascos. Just not sure what bottom bracket to get to achieve the 45mm I am after.

Chain reaction cycles say 108 ( http://www.chainreactioncycles.com/Models.aspx?ModelID=31622 ). The tiny writing on page 15 of this ( http://www.sram.com/sites/default/files/techdocs/my10-truvativ-tech-manual-rev_1.pdf ), and the extended notes on the 2nd item here ( http://www.shopwiki.com/l/TruVativ-Powerspline-Bottom-Bracket-68x108-68x108-Black ) say that will give you a 46mm chainline.

As the chainring is already on the inside of the spider you could add washers and longer chainring bolts to move the chain-line back to a normal 42mm, or pick hubs with a 46mm chainline.

Thanks - that is awesome.

Geared question:

I have a trek OCLV from 1998, it had an octalink BB (Dura ace 7700) and chainset (ditto), which need replacing. I want to upgrade to hollowtech. Is there any reason why these wouldn't fit:

ultegra bottom bracket 1 or 2 (and why would I / anyone pay more for 6600 rather than 6700?)

105 chainset

?

The BB shell on the frame has recently been faced, it's english threaded....

i have a chainset from a while ago thats been knocking about, wanting to use it on my newest project. how do you work out what shaft length is needed on the bottom bracket, i know i need a 68mm b/b but not sure on the shaft.
the chainset is a square taper set and the only measurement written on the cranks is 170mm.
i have searched the forum for a related post but havent been able to find any but feel free to direct me to it if i have missed it.
cheers

Google "Shafts Length"

That'll do the trick

I'm about to convert a Campagnolo mid-90s (Athena/Chorus?) double crankset to single (chainring on the outside) and was wondering if anyone who's done this can advise the 68mm bb I would need to get 42mm chainline. Looks like the Miche 107 would do the job and enable me to adjust slightly if necessary? Thanks.

Need help badly, i have a stronglight mygal crankset and a 90s Italian columbus frame with Italian BB. I asked stronglight which bottom to use they said their 103mm JP400 which is only available in englidh 68mm cups. Therefore I bought a Velo Orange Italian 70mm JIS 103mm spindle BB. Turns out I could not tighten cranks sufficiently without them arriving all the way to the frame/BB.

Is this a result of the difference between italian and english cups sizes 68-70mm does this mean the spindle is effectively 2mm shorter and that is the reason the cranks would not tighten all the way? Or did stronglight recommend the wrong size bottom bracket.

I then tried a 107mm bracket and this worked for a bit but the chainline is off, and i can feel a lot of horizontal force/inefficiency. Then the 107mm bottom bracket cup came out on the non drive side and pulled the chainring and drivside arm all the way to the frame seizing everything and resulting in a walk home.

Taking the bottom out the shell in the middle had come loose and the axel is no longer centred. I thought these things were ment ot be fixed. Is all this a result of the horizontal force and bad chainline. I cannot think of any other reason.

If i buy for example Sugino RD2 (that i know need a 103mm BB) and a 103mm Italian 70mm bottom bracket will it work with the frame or will it be 2mm too short as oppposed to a 68mm English BB. I dont know and where iam there is no good bike shop.

Help please!

So guys.

I have a pinarello asolo italian threaded from the 90s. i measured the bb to 68mm width.

i have this crank. so i guess it needs a squaretaper bottom bracket. The one i have is 110mm wide. but its to short. any suggestions or answers on what i need?

Thanks

A little advice, is anyone running 75s with a Paul hub? Or a hub with the same chainline... If so, what BB would you reccomend? I find all this chainline stuff mind boggling....

Tom, just get campag 111mm, sealed bearing and all that.

I had a centaur, was in a frame for about 6 months used moderately, and was rough as fuck by that time. I'll get another Token like I've got in the Argos which has been excellent.

I didn't realise 75s took ISO BB, knowledge fail on my part.

Do anyone know which year this crankset from?

i would suggest loosely installing the 110mm bottom bracket so that it is adjustable. then bolt the crank to bb. wind the bb in until there's 2mm between inner ring and chainstay, or 4mm between crank arm and chainstay, whichever's the critical dimension. then check where the centreline of the chainset is relative to the cassette, ideally should be aligned with centreline of cassette. wind the bb out if required to find this.

how much of the bb thread is left exposed? if 2-3mm this could be taken up by spacer washers placed between bb end shell and the frame (SJS sell these, among others). check that the non-drive side crank arm still clears the left hand chainstay. you will have a slight but not normally noticeable offset.

alternatively buy a bb with the additional length on both sides, which probably means going from 110 to 113 (1.5mm each side), 115 (2.5mm each side), or greater.

Also, is the BB you have Italian (ISO) tapered? If not, don't tighten the cranks on to it.
My guess for those cranks is 115mm ISO

Yesterday I did broke my Bottom Bracket (Single speed) How much does usually cost to replace it in shops? The job itself not Bottom Bracket. Was trying to replace it myself but seems I dont have right tools.

Freewheel just arrived for my new build and it throws the chainline off to 45mm. This is probably answered elsewhere but if I need to add 3mm to my chainline at the front, does this mean I need to get a bb that's 6mm longer (assuming it's symmetrical). A 107 would have given me 42, so I'm guessing I need 113 now?

Edit
I've re-measured the chainline after I put the wheel into the frame... Turns out I have a 42.5 chainline approx so I won't be touching anything for now.

Record looks to be about 1994

So Im buying the current campagnolo record pista crankset for street use- no velodrome

Do i buy a) phil wood iso BB 10.5mm with italian cups (adjustable and sealed)

           b) campagnolo record pista BB italian(not adjustable nor sealed)

According to the database only one person is running the phil wood BB. Which is the better option, what do you reckon?? PW fractionally more expensive.

I have aproximately 42mm chainline in the back with PW hubs. But had a of a problem with a pait of stronglight, read above if your interested.

cheers

Also, is the BB you have Italian (ISO) tapered? If not, don't tighten the cranks on to it.
My guess for those cranks is 115mm ISO

This is how it looks today. And yes its italian threaded.

I just buyght these cranks for mixte project. I pay'd them for 8 pounds. I asume they where worth it. Now i'm just wondering what BB will give me nice 42mm chain line and what kind of BB these will need? UN54 won't work?

Nut type spindle?

113mm BB should do you for a 42mm chainline. But from what I've read they don't play well with the Shimano BB. Maybe something else like an FSA?

113mm BB should do you for a 42mm chainline. But from what I've read they don't play well with the Shimano BB. Maybe something else like an FSA?

Thanks. I think too that Shimano BB don't work with them. Enybody, does someone noes what works with them?

Would this kind BB work?