BB Sizes
08-01-03, 02:58 PM
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BB Sizes
I've finally gotten the bike back after the LBS and Norco struggled to get the BB out. It's out and I was ready to get a new one, but the numbers on the BB are so rusted and pitted that I don't know where they are. I tried filing the rust off, and found a single number that was barely readable. The prob is that now I don't know what size BB to get. Does anyone out there know what size BB a 2000 Norco Wolverine (or other bike that uses the same frame). I checked the Norco website for specs but it just said BB type was "cartridge"... thanks. They didn't have a tech suport e-mail either. Also, what is a an "E-type" BB, a website had this type, standard and italian. I know what italian and standard are. Anyways... if I can't get the specs, what measurements do I need to take? The BB shell is in a couple pieces, so what can I measure on the frame. I at least know the BB is standard but that's it. Any help would be great...
Thanks, Matt.
Thanks, Matt.
08-01-03, 03:12 PM
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E-type most likely means English threading (most common).
As far as size goes, there are two parameters, BB shell width and spindle length. You can also add spindle type I suppose, either tapered or splined, but that's rather obvious.
You can measure BB width with a metric ruler. It is simply the width from the outside edge on one side to the other. 68mm is common.
The second parameter or spindle length, is determined by the clearance needed for the inner chainring to clear the frame and/or correct chainwheel positioning w.r.t. the rear cassette. For a double somelike like 110mm to 115mm is common. For a triple, 118mm or more.
So you will see BB like English (if they don't specify then it's english) and 68 x 118.
As far as size goes, there are two parameters, BB shell width and spindle length. You can also add spindle type I suppose, either tapered or splined, but that's rather obvious.
You can measure BB width with a metric ruler. It is simply the width from the outside edge on one side to the other. 68mm is common.
The second parameter or spindle length, is determined by the clearance needed for the inner chainring to clear the frame and/or correct chainwheel positioning w.r.t. the rear cassette. For a double somelike like 110mm to 115mm is common. For a triple, 118mm or more.
So you will see BB like English (if they don't specify then it's english) and 68 x 118.
08-01-03, 03:55 PM
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Some terms:
English (standard) / Italian: threading on the cups: English has Lh thread on non-drive side, Italian is RH threaded both sides.
E-type: more for derailleurs than BBs. An E-type is for frames without a regular seattube (e.g. full sus). The Derailleur has a clamping ring held in by the BB cup. Shouldn't be an issue for you.
Tapers: there are several types. 2 common tapers - ISO and JIP (sometimes refered to as Japanese/Asian). Each has same angle of taper, but one is slightly larger than the other. The taper required is determined by your crank arms. Splined: usual splined is the new ISIS standard, but Shimano have a couple of sizes of their own, none of these are interchangeable.
There, that should be sufficiently confusing. If you don't what your doing, get thee to a LBS.
English (standard) / Italian: threading on the cups: English has Lh thread on non-drive side, Italian is RH threaded both sides.
E-type: more for derailleurs than BBs. An E-type is for frames without a regular seattube (e.g. full sus). The Derailleur has a clamping ring held in by the BB cup. Shouldn't be an issue for you.
Tapers: there are several types. 2 common tapers - ISO and JIP (sometimes refered to as Japanese/Asian). Each has same angle of taper, but one is slightly larger than the other. The taper required is determined by your crank arms. Splined: usual splined is the new ISIS standard, but Shimano have a couple of sizes of their own, none of these are interchangeable.
There, that should be sufficiently confusing. If you don't what your doing, get thee to a LBS.
08-01-03, 04:12 PM
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Thanks, that was exactly what I needed to know, now, I just have to measure the BB but it's in a few pieces, the LBS couldn't even get it out so they sent it to Norco and they had to cut it apart....
08-01-03, 04:56 PM
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E-Type is for Derailuers. Specialized FSR frames use these. The Derailuer hanger is bolted between the BB and the frame.
Euro threading is regular. Drive Side is reverse threaded. 99% of Mountain bikes have this.
Italian threading both have right hand thread's (both sides reversed). Won't fit your frame.
American is a press fit style.
Doonser covered everything else.
Euro threading is regular. Drive Side is reverse threaded. 99% of Mountain bikes have this.
Italian threading both have right hand thread's (both sides reversed). Won't fit your frame.
American is a press fit style.
Doonser covered everything else.
08-01-03, 06:06 PM
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Originally posted by hayneda
E-type most likely means English threading (most common).
As far as size goes, there are two parameters, BB shell width and spindle length. You can also add spindle type I suppose, either tapered or splined, but that's rather obvious.
You can measure BB width with a metric ruler. It is simply the width from the outside edge on one side to the other. 68mm is common.
The second parameter or spindle length, is determined by the clearance needed for the inner chainring to clear the frame and/or correct chainwheel positioning w.r.t. the rear cassette. For a double somelike like 110mm to 115mm is common. For a triple, 118mm or more.
So you will see BB like English (if they don't specify then it's english) and 68 x 118.
E-type most likely means English threading (most common).
As far as size goes, there are two parameters, BB shell width and spindle length. You can also add spindle type I suppose, either tapered or splined, but that's rather obvious.
You can measure BB width with a metric ruler. It is simply the width from the outside edge on one side to the other. 68mm is common.
The second parameter or spindle length, is determined by the clearance needed for the inner chainring to clear the frame and/or correct chainwheel positioning w.r.t. the rear cassette. For a double somelike like 110mm to 115mm is common. For a triple, 118mm or more.
So you will see BB like English (if they don't specify then it's english) and 68 x 118.
You just answered one of my questions I was always afraid to ask.
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08-01-03, 07:23 PM
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Originally posted by doonster
Some terms:
Tapers: there are several types. 2 common tapers - ISO and JIP (sometimes refered to as Japanese/Asian). Each has same angle of taper, but one is slightly larger than the other. The taper required is determined by your crank arms. Splined: usual splined is the new ISIS standard, but Shimano have a couple of sizes of their own, none of these are interchangeable.
There, that should be sufficiently confusing. If you don't what your doing, get thee to a LBS.
Some terms:
Tapers: there are several types. 2 common tapers - ISO and JIP (sometimes refered to as Japanese/Asian). Each has same angle of taper, but one is slightly larger than the other. The taper required is determined by your crank arms. Splined: usual splined is the new ISIS standard, but Shimano have a couple of sizes of their own, none of these are interchangeable.
There, that should be sufficiently confusing. If you don't what your doing, get thee to a LBS.
,confusion contusion...It's JIS(Japaneese Industrial Standard) not JIP. JIS starts and ends biggger than ISO(campy)...Shimano is the usual spline,ISIS came after,and one is not compatible with the other. Shimano xtr,and road splines are compatible.but xt,lx and deore use a different pattern.
