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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 10-05-09, 01:59 AM   #1
tkp
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Questions from Hanoi about stx repairs and maintenence

Hello all.

Firstly I'll make the traditional newbie apology for asking too many, no doubt stupid, questions and obviously failing to weed out useful answers from the dark depths of the search forums function.

I have just got my hands on a 1994/5 diamondback ascent and need to do some work on it. Problem is I am in Hanoi, Vietnam and very few bike specific tools are available. I will need to get virtually everything send from home. I am posting here to make sure I don't make any purchasing errors when getting tools and parts together as it is not like I can pop down to the bike shop and I am new to this game.

So, first off I need to service the hubs.

Front is Shimano stx HB-MC30
Rear is Shimano stx FH-MC30

After plenty of confusion as to whether the rear hub is a freehub and cassette or freewheel (caused by a post here stating that all stx rear hubs are freewheel hubs) I am 99% sure that the rear hub is a freehub with cassette (I suppose the part number is a clue...) and I have included a photo.

I have a horrible feeling that they may be beyond repair after noticing the front hub making an infrequent but loud click noise (especially when rotating the wheel backwards) I notice this most when trueing the wheel because it sometimes causes the rim to skip to one side towards the brake pad (note this is random and it is not because the wheel is out of true).

For this first post I hope someone can tell me what size cone wrenches I need to take the hubs apart (and the minimum number).

What tools I need to remove the cassette from the freehub. (again the bare minimum requirement/diy options welcome as I am on a tight budget)

And what tools I need to service the bottom bracket. Not sure which crank puller to go for and can't find a part number for the bottom bracket.

Would I also need to order shimano bearings? And is it wise to order a good tube of grease while I'm at it? (not sure of the quality of stuff found here)

Once again sorry for such a long post, I have spent ages trawling the search function but never seem to find specific answers. It would be very stupid of me to order a load of stuff and wait 3 weeks for it to get here only to find I got the wrong size wrench or something.

PS. can't seem to load Image from computer but the cassette looks just like this one from Sheldon Browns page, except the writing on the lockring says: SHIMANO HYPER GLIDE-C
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Old 10-05-09, 02:01 AM   #2
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http://www.sheldonbrown.com/free-k7/...-lockring.html
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Old 10-05-09, 02:12 AM   #3
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You will need a lock-ring tool to remove the cassette. And a chain-whip to hold the cassette in position as you remove the lock-ring that holds the cassette. A bar-type torque-wrench with a 0 - 600 inch-pound range will be needed to replace the cassette properly.

You will also need cone-wrenches to open the hub, as well as either a adjustable wrench or a box-wrench to take the hubs apart. And - preferably - fresh ball-bearings to overhaul the hub with and to replace the old ones.

Help available here:

http://www.parktool.com/repair/readhowto.asp?id=105

And here:

http://bicycletutor.com/overhaul-wheel-bearings/

As for your bottom-bracket, here's a few hints:

http://bicycletutor.com/overhaul-wheel-bearings/

And....

http://www.parktool.com/repair/byreg...ageField2.y=10

These links should get you started.

Oh! And hello to Hanoi from Burlington, Vermont!
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Old 10-05-09, 02:27 AM   #4
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Hey mate, thanks for your quick and concise reply. I will get these tools ordered.
Wish the post could be faster, I want to get into it now!!
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Old 10-06-09, 05:13 AM   #5
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Quote:
Originally Posted by tkp View Post
I have just got my hands on a 1994/5 diamondback ascent
I have a 1994 DB Ascent.

Quote:
Originally Posted by tkp View Post
Front is Shimano stx HB-MC30
Rear is Shimano stx FH-MC30

... I am 99% sure that the rear hub is a freehub with cassette
Yes, freehub and cassette.

Quote:
Originally Posted by tkp View Post
For this first post I hope someone can tell me what size cone wrenches I need to take the hubs apart (and the minimum number).
Front hub needs a 13mm cone wrench and a 17mm wrench of any thickness (ie a cone wrench or regular wrench).

Rear needs a 15mm cone wrench and the same regular 17mm.

Quote:
Originally Posted by tkp View Post
What tools I need to remove the cassette from the freehub.
A fairly standard cassette lockring tool and some way of holding the cassette. A chainwhip is the pro tool, but a gloved hand might work, or an old chain held in a vice.

Quote:
Originally Posted by tkp View Post
And what tools I need to service the bottom bracket. Not sure which crank puller to go for and can't find a part number for the bottom bracket.
The original bottom bracket is a really low end Shimano sealed BB - maybe BB-LP20? (I don't want to go pull my old one out of the junk bin.) It is not serviceable. You can replace it with a Shimano BB-UN26 68x110, or a BB-UN54 68x110, or just about any Shimano BB that is 68x110.

You will need a generic crank puller for square taper cranks. You'll also need a splined BB installer/remover tool. Note - the original BB installs from the ... left. The replacements will install from the customary right. Also note - for the original and replacement BB, the drive side is reverse threaded as normal for an English spec BB.

Quote:
Originally Posted by tkp View Post
Would I also need to order shimano bearings?
Generic bearing balls are fine. Front needs twenty 3/16" loose bearing balls (ten per side). Rear needs eighteen 1/4" balls (nine per side).
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Old 10-06-09, 03:37 PM   #6
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Say, isn't Hanoi thicker with bicycles than with people? Surely there's a bike shop nearby.

(And yes, Vietnamese axle grease is as good as anyone else's axle grease...)
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Old 10-12-09, 01:44 AM   #7
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There is only one bike shop I know of which has any quality parts at all. He is miles away and has a very limited stock purely for servicing the bikes he uses on organised tours. He is nice dude and a good mechanic but the shop is miles away and I would rather do most of the work myself.
There are tons of other bike shops but they only sell cheap locally made, or Chinese imported, parts and I won't have any of them touch my bike. They do their work with very little care for the machine!
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