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Old 05-11-11, 08:58 AM   #1
BG2
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Dura Ace FH 7400 rear hub help needed

Here's the problem.

I have this hub and i don't know how to assemble it correctly.

I has to do with relacing a rim and getting it in the middle becomes difficult in watching the angle of the freehubside spokes.

I need to tackle this step by step so here go's.

A the spacers i can't figure out what should be on what side so from the cones onwards what is the length of the washers/bushings on either side.
How can i find out what is the correct length needed on what side.

B From the inside crank gear on what rear sprocket should the chain be straight that way i can maybe determine the length of the washers/bushings on either side

C i have a feeling that the axle isn't original anymore so if anyone can give any clues on how to identify this one being original do let me know.

D i have a feeling while looking at the spokes how 'straight' the driveside looks compared to the non drive side this can't be correct.
Any idea how to find out if i'm misleading myself or that it is indeed not right.

E i have read on a similar problem regarding dishing of a wheel that the easiest way to determine the spacing of the axle is by flipping the wheel over in the wheelstand and when there is no difference it's ok.
Is this a correct way to 'cure' my problem.

The hub is part of a complete 7400 6 speed groep



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Old 05-11-11, 02:56 PM   #2
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you need a exploded diagram and I can't find that half of my big shimano book.
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Old 05-11-11, 03:10 PM   #3
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Its like any other hub. After the cones you put a washer and then a locknut on either side.

Space it so the small sprocket is as close to the drive side dropout as possible without interfering with the frame.

Fill the non-drive side with spacers until its the correct width for your frame.

The drive side spokes will be more Straight up and down than the Non-Drive side spokes. That's how its supposed to be.

You are correct about checking the dish of the wheel by flipping it over in the stand. Alternatively you can just install the wheel on the bike and use the brake pads as a reference for the dish.
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Old 05-12-11, 11:33 AM   #4
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Hmm, yes maybe the other half could be the answer to the problem, but zaphod beeblebrox has some interesting answers that i will try this weekend and i must be able to get this one going.

Despite my uncertainty reading your reply does takes away some of it.

Good to read i was on the right track and with your reply i must be able to get it right.

Thanks for the replys as it's much appreciated.
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Old 05-12-11, 11:45 AM   #5
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http://www3.big.or.jp/~number-1/NO.1...noFH74038.html
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Old 05-12-11, 11:55 AM   #6
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Ah yes nearly close as it should be a 7400 model, but this is good enough to get me going.

Thanks
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