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Bicycle Mechanics Broken bottom bracket? Tacoed wheel? If you're having problems with your bicycle, or just need help fixing a flat, drop in here for the latest on bicycle mechanics & bicycle maintenance.

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Old 04-29-06, 08:49 PM   #1
JJXJ
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2001 GT Aggressor 3.0 Upgrades?

Hey all! I am new to the site, and am impressed with all the knowledge here. I have been into riding all my life, but I would always ride a stocker into the ground, or they would get stolen. So I've never had the opportunity to really mod any bikes. I've got new brakes on the way, but I am wanting to upgrade the bottom bracket and maybe the cranks right now as well.

Does anybody know what tools I would need to change these out? Does this look right for crank removal? http://www.parktool.com/products/det...6&item=CCP%2D2

Also would I need anything special for removing the bottom bracket? Or should that just unscrew?

Finally, does anybody know the bottom bracket and crank specs for the aggressor 3.0? I'm in Alaska, so it would be beneficial to order the tools and parts at the same time...

Thanks you all VERY much!

Justin
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Old 04-30-06, 03:08 PM   #2
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Does anybody know of a online resource that would tell me the specs of the bottom bracket? I'm really new to this stuff, but I can rebuild a automatic tranny in a car. It is almost embarassing...
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Old 05-01-06, 02:32 PM   #3
NM-NewRoadie
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Do a google search for sheldon brown, he has some specs listed on his web page for older bikes. Though I don't know if yours will be on there. Also on most bicycle parts if you remove the item, it will have a size stamped or labeled on it.

For tools I'ld recomend a full toolkit from someplace like nashbar.com I picked up one for about $20 bucks on a good sale, that has a number of bicycle specific tools. http://www.nashbar.com/profile.cfm?c...eid=&pagename= well worth the full price investment though.

You will need a special tool to remove the bottom bracket, it's basically a funky socket, that crank tool will get the cranks off, but "park" tools are basically top of the line. If you're only doing this a couple of times, generic tools used carefully will be plenty good. That kit I linked too has a number of flat wrenches, that although seem insane to use on car type stuff, are very usefull for reaching certian things on a bicycle.

As a car mechanic turned cyclist who does my own wrenching, I'll give the following advice. 1) look out for things that are threaded backwards (pedals come to mind) 2) just take it easy, leave that impact wrench in the drawer! 3) research, a lot. 4) if your not sure it's right, have a shop check it out before you do anything wild on it. For example after I converted to a threadless headset, and installed my own new fork, I had a shop "go over it" they charged me an extra $5 above a standard tuneup to set the bearing tention right on the headset, but it was worth the money considering you really don't want that coming loose.

Good luck!
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Old 05-02-06, 06:09 PM   #4
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Thanks for the info NM-NewRoadie! I really appreciate the info!
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