Here is one for all you ace bicycle mechanics out there! I need to pull the cranks and bottom bracket off my Trek 7100 so I can lube it (possibly replace bearings) and I am thinking I might try changing out the cranks as well. There are a lot of places on the net to find very good tutorials on how to do it, but how do I know which specialty tools I need to get first? This is what I know from Trek's site about the cranks: Shimano M151 48/38/28 w/chainguard.

I have had it up on the stand, and while I have worked on cars and motorcycles, I'm not sure what I need to look for, or what the part (Shimano M151) actually tells me beyond the obvious. Any thoughts, or direction to the proper resources is greatly appreciated!!

Park Tools .com is a good source

You will need a crank puller for square tapered type crank. If it has a cartridge bottom bracket you will need a BB extractor to replace it, but the bearings are not accessable for maintenance.

This is correct.

The crank is square taper - it'll either use a 15/14mm recessed nut or a 8mm hex to remove whatever is securing the crank on. You'll then need a square taper type crank puller. Park CCP-22



Trek doesn't even list the type of bottom bracket it has - you'll need to know this in order to select the correct tool for removing this from your frame. You can take a picture once the cranks are off and we can determine the correct tool for you.