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?
Surly CC, Raleigh Team Pro, Specialized Rockhopper
I want to say 68/109 English Thread. Whatever crank you go with...make sure you buy a compatible bb.
ISIS bb with ISIS crank
square tapered with square tapered
To remove, you are going to need a crank puller tool, a pin spanner, and a lockring tool.
To install a newer crank/bb, you will need probably another compatible bb tool to accommodate these newer versions.
1. Are any of the systems (square-taper, ISIS, Octalink...) considered "better" or more reliable than the others? (Square-taper obviously isn't idiot proof!)
2. Do you agree with my completely uneducated diagnosis - that the aluminum crank arm is the damaged part [vs the steel (???) BB axle]? The reason I ask is because, to be perfectly honest, the current BB functions just fine (no grinding, etc - even with ~5000 miles on it). I could probably just keep it, if I decide to stick with square-taper.
Last edited by The_Mickstar; 08-02-08 at 12:04 PM.
2003 Specialized Hardrock, 2004 LOOK KG386i, 2005 Iron Horse Warrior Expert, 2009 Pedal Force CX1
For the crank, since you are using an 8 speed chain, I would stay away from any crank intended for 9/10 speed applications. You may have issues with the chain being too wide (I did trying to use an 8 speed chain with 9 speed Shimano chainrings) unless you change your chain too.
Cranksets differ as to where they bottom out on the bottom bracket so you will want to make sure whichever crankset you buy will either fit your current BB or that you buy a compatible one with it. Usually, when you buy a new crankset, the manufacturer tells you what bottom bracket length is needed.