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Old 01-03-05, 01:40 PM   #1
squeegy200
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I'm not a professional wheelbuilder. I've only accomplished conventional 3cross wheelsets. I've built, trued, and repaired my own conventional wheels for years.

But I've encountered something which I may need some guidance.
I recently bought a set of the new Shimano RH550 pre-built wheels. On one of my first outings, I had an encounter with a four legged beast which is chronicled in another section of this forum. In my attempt to avoid the beast, I snagged my tire valve on some roadside debris which consequently tweeked my front wheel.

Now I need to straighten it. The wobble is slight and only side-to-side. The rim is still circular.

Should have been a simple tuning project as I've done this many times with conventional wheels. One new challenge which shouldn't be a problem is that the nipples are at the hub rather than at the rim. BUT these wheels only have 16 radially laced bladed spokes on the front wheel. The spacings inbetween spokes are wide.

Correcting small lateral wobbles seems to be impossible if the rim malformation is inbetween spokes.

Is there a method for straightening a wheel with so few spokes? Any special considerations for Shimano wheels with Nipples at the hub? I already discovered that it doesn't use conventional spoke wrenches and uses an unconventional oversized nipple. Again easily overcome using small metric wrench but difficult to twist when mounted in my Park truing stand.

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Old 01-03-05, 07:27 PM   #2
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Squeegy,

Yep, Everytime I have had to true one of these up, or replace a spoke, I have just used an adjustable spanner on the nipples (corresponding to the spoke I wish to tighten).

I think that you are unluckier with a bend in between spokes - this one would require some "attitude adjustment" using two blocks of wood (to lay the rim on) and a soft mallet to bang on the rim to flatten it out. Tightening and loosening spokes will not produce a satisfactory result.

Make sure you mark the high point of the wobble (so to ensure that that is the force of your "adjustment"), and that the blocks are placed to isolate the wobble/bend only.

Patience will be the key here - but it can be done.

Good luck, and don't try this one under the influence of alcohol - you'll lack finesse!
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Old 01-03-05, 11:03 PM   #3
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For the spoke nipples, I love my motorcycle spoke wrench. It has them all the way up as big as 3/16(whatever gage that is). looks like a big ring with slots all the way around.
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Old 01-04-05, 02:44 AM   #4
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[QUOTE=squeegy200] Now I need to straighten it. The wobble is slight and only side-to-side. The rim is still circular. Correcting small lateral wobbles seems to be impossible if the rim malformation is inbetween spokes./QUOTE]

To correct a wobble that's between two spoke pairs you have to work with both of the adjacent spoke pairs. If the high point is right in the middle, adjust both spoke pairs equally. If it's closer to one of the spoke pairs, adjust that pair more than the other.
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