Crank arm stripped
 

Do they sell replacement arms or must i order a whole new crank? Its a shimano 170mm.

Check eBay

Check with your LBS. Both Stein and VAR make a kit for repairing stripped out cranks and installing one-key releases. If they have one, the repair may be a lot cheaper than replacing, depending on the quality of the crankset. Minor thread damage can sometimes be repaired with a crank arm chaser sold by Bicycle Research.

thanks guys

Separate left or right crank arms can be ordered at most LBS's from QBP. Most of the common Shimano group types are available.

Here is a search result from the QBP section on the Harris Cyclery site (searching on "crank arms" and "Shimano"):

http://harriscyclery.net/page.cfm?Pa...rch&startRow=1

This search returns five pages of hits and a lot of the stuff is not crank arms, but if you can't find your crank arm here then your LBS should be able to order it for you. Good luck!