Join Date: Dec 2005
Location: O'Fallon, MO
Bikes: 1973 Raleigh Professional, 1993 Raleigh Technium Olympian, 2006 Cervelo Dual, 2008 Cannondale Caad8, 2010 Kona Unit, 2013 Trek Superfly 100 AL Pro, 2014 Trek Crockett 9
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Need new crankset for older road bike, but don't know (specifically) what I need...
I have an early-90s Raleigh Technium Olympian road bike. It is currently outfitted as follows:
Shimano Exage 400EX (Narrow) front derailleur
Shimano Exage 300EX rear derailleur
Shimano Exage 300EX crankset with Biopace 52/40 (for Narrow Chain Only) chainrings
SRAM PC-58 chain
Shimano Hyperglide "E" 12/28 7-speed cassette
Shimano Ultegra 8/9/10-speed freehub wheel with 4.5mm spacer (to accomodate 7-speed cassette) (frame has 130mm rear spacing)
The only non-stock pieces are the chain and the wheels. It functions just fine, with one exception...
The non-drive side crankarm continually comes loose. It's to the point now that even cranked down fully, the arm still has a little play. As you may have guessed, I think the actual problem is that the taper in the aluminum crankarm is "wallowed out" from riding with it loose. So, long story short, I want to get a new crankset to solve not only this issue but a couple of other things I'm not thrilled with on the bike.
What I would like is 180mm crank arms (I'm 6'2, have long legs and prefer longer crank arms) and standard, round rings.
And, while I'm at it, it probably wouldn't be a bad idea to install a new bottom bracket, since the current one has ~5000 miles on it, and is the stock piece. This may also make things easier, if I could go with something more modern on the cranks by switching the bottom bracket at the same time. (???)
Can you tell me, specifically, what I'd need to pull this off? Can I use a modern 9/10-speed crankset, or is the chainring spacing/width different? What about the bottom bracket? Can I use a modern external bearing design? (Anyone know what bottom bracket this frame takes? English? 68mm?)
Finally, I'm thinking of switching to either 8-speed (new cassette) or 9-speed (new cassette & chain. Would that change the answers to the above?