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It's the red one, you're measuring the width of the bottom bracket shell, the two cups, which you've included in the blue measurement are part of the bottom bracket. Good luck :)
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Axle end-to-end like 31trum said - which means you've got to take the cranks off to get a proper measurement.
Ha - what Pifko said.
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No, they're unrelated
BB axles come in all sorts of lengths, rear dropout spacing is usually one of about 4 sizes, and none really has an influence on the other -
I'd avoid the stronglights pictured at all costs, they don't have a removeable chainring, so once it's worn you'll have to replace the whole chainset. For road/track riding I'd avoid the Truvativs as they have an MTB standard BCD, not a road, so might be more difficult/expensive to get new chainrings for. In case you don't know BCD is the Bolt Circle Diameter, basically the distance between the bolts that hold on your chainring, for a chainring to fit your chainset it'll have to have the right BCD.
Others may think differently, but I'd always go for a chainset with a BCD of 144mm (it's the Campag standard, Sugino 75s and others) or failing this 130mm (can't immeadiately think of many chainset's with this BCD, the Ambrosio Pista, but not many of those around, but it seems to be quite easy to get 1/8" chainrings in this size). The exception to this rule is the Miche Primato chainset, which I think is quite nice, but has a BCD of 135mm.
I know the FSAs have either a 130mm or 144mm BCD, I can't remember which, think they're an okay budget crank, my brother had them on a bike I built for him. He's rubbish at maintaining his bikes, so may not have been careful enough about making sure his crank bolts were done up tight enough, but he shredded the taper on the drive side crank, so I'd say these are softer/less robust that some other cranks. Not a disaster, but maybe less of a fit and forget than a better set of cranks.
May be more than you want/can spend at the moment, but Ribble are doing this *[/U]Stronglight track chainsets at the moment for £73, though this is without a bottom bracket, not convinced it's as good a deal as the almost 40% off they claim, but think its a good price for this chainset. Was looking for something else, but if they're no too long for you, depending on the reserve,[U] *these might prove to be a real bargain. Good luck :) *
*[URL="http://cgi.ebay.co.uk/STRONGLIGHT-FIXIE-CHAINSET-SINGLE-RING-52_W0QQitemZ220392983667QQcmdZViewItemQQptZUK_sportsleisure_cycling_bikeparts_SR?hash=item220392983667&_trksid=p3911.c0.m14&_trkparms=72%3A1683%7C66%3A2%7C65%3A12%7C39%3A1%7C240%3A1318"][/URL]
polybikeuser
31trum
pifko
Richard_Cheese
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About
BB shell measurement confirmation
Posted by
@zep
Hi peeps :D
im getting a new BB online and i came across this guide below:
**"There are two key measurements that you need to know when ordering a bottom bracket.
The first is the width of your the bottom bracket shell on your bike's frame. You can measure that with an ordinary metric ruler but you have to be pretty precise. ** If it's 68 or 73mm, you have an English threaded bottom bracket. If it's 70mm, you have an Italian threaded bottom bracket..."
Im totally stumped as to which measurement to use, could you comment on the picture ive attached and tell me how i measure the shell?
do i measure the red line or the blue line?
Sowwie if this is a nubbins question but i arr very lost atm....!
thanks in advance
o_O? <---- Zep