Query about Stronglight BB

My first posting; hopefully, I'll not make a fool of myself & it'll make some sort of sense

Hi there,

I''ve a Stronglight 80 chainset (double) (NOS) that I'd like to put on my bike. I'm struggling to identify what size & type bottom bracket I need for it.

I'd like to fit a lightweight and good quality BB; I contacted Spa Cycles, but even they were uncertain as to what would be best. I was told that I could fit ISO **or **JIS. I'd don't mind forking out for a good unit - I just want to buy the right one. Some websites say that a Stronglight 80 (double) requires a 113mm BB, others say 118mm; can anyone of the experts out there provide a definitive answer ?

A link to where I good buy one would be much appreciated. Or does anyone have one to sell ?

Ta v. much !

I think (I have read on the internet) that stronglight 80/100 are JIS taper. and need quite a long spindle.

I was looking at them to use a ridiculously long titanium BB that I have sitting around.

My hunch is to go for 118mm.

I'm surprised spa cycles didn't know for sure - they are the stringlight kings.

I think (I have read on the internet) that stronglight 80/100 are JIS taper. and need quite a long spindle.

I was looking at them to use a ridiculously long titanium BB that I have sitting around.

My hunch is to go for 118mm.

I'm surprised spa cycles didn't know for sure - they are the stringlight kings.

If it would be suitable for my bike, I might be interested in buying it from you.

Spa Cycles told me that I could use ISO or JIS, but even they were uncertain as to what size I would need.

Thank you for taking the trouble to respond so promptly.

No worries.
My BB is really massive, 130+mm! and for a 73mm BB shell.
I can only find OLD Sugino GT BMX cranks or retro Bullseye cranks to fit this.

Are you using it with just one chain ring yes? If so are you putting it on the inside or outside of the spider... that will affect what length BB you need. Sometimes cranks intended to be used as doubles hit the chain stays if you use a short BB and try to put the chain ring on the outside of the spider to get correct chain line, so you have to put the chain ring on the inside of the spider and compensate with a slightly longer BB.

First things first, do you know what chain line your hub gives you? Probably around 42mm?

If you're able to work BB length out roughly then I would always err on the side of going a couple of mm short rather than long. Easeir to space it out with 1 or 2mm of spacers to get good chain line than it is if it's too long and you have to space out the sprocket on the wheel (which is tricky and sometimes not possible with limited thread width on your hub).

Most examples in the transmission database ( http://www.lfgss.com/thread3372-6.html ) show most people using BB between 107mm and 110mm for different Stronglight cranks with track hubs, but yours could be completely different. I'm not familiar with Stronglight 80 cranks.

You don't have an old BB around that you could fir and then work out how far off it is from straight chain line do you?