Simon Head
Active Member
- Location
- Kidlington
Will a new BB, for example to fit a Shimano 105 chainset, fit my 20 year old steel frame?
I think it will but I hate getting caught out!
I think it will but I hate getting caught out!
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What chainset is fitted to that 30 year old frame?
It's a Shimano Hollowtech II, possibly 105 but HTII Sora, Tiagra, 105, Ultegra and Dura-Ace will all fit.What chainset is fitted to that 30 year old frame?
Are they all the same apart from the name?It's a Shimano Hollowtech II, possibly 105 but HTII Sora, Tiagra, 105, Ultegra and Dura-Ace will all fit.
To answer this we need to know what model of chainset you are actually aiming to fit (as opposed to 'for example'). It may be that the chainset is 20 years old too and thus needs a UN55 square taper or similar. This assumes the frame is 'English' threaded - it will probably be 68mm wide. If the OP's chainset is Hollowtech II, see rr's and smokey's advice. OP: "Are they all the same?" See Sheldon Brown on bottom brackets (scroll about 1/3rd down).Will a new BB, for example to fit a Shimano 105 chainset, fit my 20 year old steel frame?
It's a 105 double but that bike has also in the past had an Ultegra triple fitted (it was removed along with the matching GS rear mech to go onto an aborted Mercian build). But as @smokeysmoo says any HT II will fit a 68mm BSA bottom bracket shell.What chainset is fitted to that 30 year old frame?
Yes they are, (the only real differences in layman terms are aesthetics and weight). In a nutshell the hierarchy starts from Sora and goes upto Dura-Ace.Are they all the same apart from the name?
105 is where Shimano 'qualiity' starts.Yes they are, (the only real differences in layman terms are aesthetics and weight). In a nutshell the hierarchy starts from Sora and goes upto Dura-Ace.
105 is a good compromise of weight v function IME.
FWIW my best bike has full DA, but I've also had 105 and Ultegra, and TBH you'd be hard pushed to tell the difference in real world cycling.
A major consideration for most is cost, (initial purchase and replacement cost), and 105 is also arguably the best compromise in this regard too.
Can I use my Shimano 600 chainset?