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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 10-20-07, 11:10 AM   #1
climbhoser
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New old bike overhaul q's.

So, I traded for a Cannondale 3.0 from '91. It has Suntour GPX all over. I don't think the previous owner ever did anything to it, and amazingly the shifting is 105 crisp. I know pretty standard stuff, like getting a new chain, is in order, but I want to get everything back to tip top.

One more note: the BB seems to have a very little amount of play in it. Maybe 1 mm or so, but you can definitely see it. Is this bad and how do I fix it? Or should I just get a new BB.


As for the derailleurs, how can I maintenance them? When I pedal, there is a sort of grumbling noise that seems to eminate from the pulleys on the rear guy. Is there a pulley overhaul I can do?

Hubs. The hubs seem good, but I want them to be perfect...is there a way to open up a hub for a regrease and a repack?

The headset seems fine, but I'm thinking I should open 'er up and repack with grease there, too.

Rims are true and round, and I think they can remain untouched.

Are new cables worth it if the old ones work? Also, surprisingly the brakes work incredibly well and have new pads. However, they are GPX cantilever and if there's something I can do to keep them tip top what is it?

It has been a really long time since I did any of this, and all advice and details are appreciated. For instance, is there a too tight on a threadless headset? If I need to repack the BB what tool would I get? Would I need to remove the cranks, too?

Oh yeah, and if I decide it's too much to do myself, how much would a shop charge just to give it the quick overview like I'm talking about (repack and regrease)? Chain included but not cables?

Thanks
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Old 10-21-07, 06:37 AM   #2
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You need to check out Sheldon and Park Tools. They will be able to describe what you need to do in more detail than we will. Things to definitely fix: BB play, derailluers (probably disassemble, clean, and lube).
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Old 10-21-07, 07:28 AM   #3
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Entire books have been written attempting to answer your questions. Bicycling Magazine's "Complete Guide to Bicycle Maintenance and Repair" and Lennard Zinn's "Zinn and the Art of Road Bike Maintenance" are two of the standards. The Park Tool web site and Sheldon Brown's web site are also great resources.

As to your specific bike, it probably should be given a complete overhaul and relube. Fix the bottom bracket right away. A bike shop would probably charge about $75 to $100 to do the complete clean and lube you need.
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Old 10-21-07, 08:28 AM   #4
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Thanks for the friendly responses, guys. I know it's probably easy to reply with some sarcastic comment about the "search" function. I'm a cheap and poor guy, so I'll see what I can discover on my own. I lack a crank puller and BB tool, we'll see how I can go there.
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Old 10-21-07, 09:31 AM   #5
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Originally Posted by climbhoser View Post
I lack a crank puller and BB tool, we'll see how I can go there.
A crank puller is a fairly inexpensive tool. The Park CCP-2 is the correct model for your Sun Tour crank and can be adapted to fit newer designs if you get one.

Bottom bracket tools for your (I presume cup-and-cone) bike are not common anymore as most new bottom brackets are cartridge types and use a Park BBT-2 or similar tool. It might be worth it to have the bike shop remove the current bottom bracket for you and replace it with a sealed cartridge rather than buy tools that won't be used in the future.
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Old 10-21-07, 10:27 AM   #6
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Originally Posted by HillRider View Post
A crank puller is a fairly inexpensive tool. The Park CCP-2 is the correct model for your Sun Tour crank and can be adapted to fit newer designs if you get one.

Bottom bracket tools for your (I presume cup-and-cone) bike are not common anymore as most new bottom brackets are cartridge types and use a Park BBT-2 or similar tool. It might be worth it to have the bike shop remove the current bottom bracket for you and replace it with a sealed cartridge rather than buy tools that won't be used in the future.

Thanks. You seem very knowledgeable, so I'll ask you a more specific question.

I was thinking about replacing the BB anyways, and I have a friend who will give me a UN73 for $10. It is 68 shell with a 107 spindle. I realize this is a short spindle, but it's a great price and if I can fit it with my Suntour GPX it would probably be worth it, no? So, do you think it will fit? Or do you not have enough info?

Oh yeah, the UN73 has never been used, not even once.
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Old 10-21-07, 10:44 AM   #7
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Whenever I come across older bikes I do a thorough check on everything and this includes overhauling and reapacking all the main bearings and making sure that they're set properly.

The garage queens seem to need the most as they are often the bikes that weren't ridden much and quite often, were never serviced so the wheel and bb grease has often turned to paste.

A lady came into the shop with a mint 1976 Raleigh 3 speed the other night and all the grease in the bb and front hub was pretty much petrified although the bearings and cups were pristine.

Servicing a 3 piece bb isn't hard and I still run them on many bikes as a well made 3 piece bb is a wonderful thing.
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