> > From: Adam Maas <[EMAIL PROTECTED]> > Date: 2007/05/18 Fri PM 12:20:17 GMT > To: Pentax-Discuss Mail List <[email protected]> > Subject: Re: OT: 2-wheeled journey of hell into the heart of darkness > > mike wilson wrote: > >> From: Adam Maas <[EMAIL PROTECTED]> > > > >> Oh, and as a further note, my bike uses pretty much the same technology > >> as those British touring bikes, only real difference is the modern > >> threadless headset (which isn't really an improvement for road bikes), > >> the fact I use a track hub threaded for a single-cog freewheel instead > >> of a Sturmer-Archey 3 speed and the dual-pivot brakes (which are > >> actually a real improvement). Even the frame is old-fashioned > >> double-butted 4130 steel built with brazed lugs just like those British > >> tourers, the only difference is that my frame is Butted, which didn't > >> really become common until some time in the 60's or 70's. Apart from my > >> rear wheel(which is 130mm spaced like the current standard, '55 era > >> would be 120mm), fork, headset and stem, everything on my bike is > >> interchangable with any non-Raleigh British bike of that era (Raleigh > >> used nonstandard 26tpi threads on everything instead of british standard > >> 24tpi threads). > > > > Other way round. BSC (British Standard Cycle)is generally 26tpi, although > > there were others. Derived from the CEI thread, which had a lot more > > variation. From the days when engineers designed things to be best at what > > they were supposed to be doing, rather than easiest to make. > > BSC > > http://homepages.tesco.net/~A10bsa/bscgo.htm > > CEI > > http://homepages.tesco.net/~A10bsa/ceigo.htm > > > > BTW, if anyone needs some funny-sized stainless nuts... > > http://stigfasteners.easywebstore.co.uk/BS-Cycle-Threads-26-20-TPI_B234V.aspx > > Not according to Sheldon Brown, who is an aknowledged expert on older > Raleigh stuff over here(and owns enough to know the difference): > > http://sheldonbrown.com/raleigh26.html
He's talking about bottom brackets and steering heads, I think. It's not clear from the page. Once over 1", BSC goes from 26 to 24tpi. Looks like Raleigh stayed with the CEI system, which is rather more convoluted. TPI go _up_ as the diameter increases, at one point. There is a table here but it consists, on my browser, of black numbers on a black background. I had to highlight it to read them. http://www.sizes.com/tools/thread_CEI.htm ----------------------------------------- Email sent from www.virginmedia.com/email Virus-checked using McAfee(R) Software and scanned for spam -- PDML Pentax-Discuss Mail List [email protected] http://pdml.net/mailman/listinfo/pdml_pdml.net
