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Rear hub changing, related questions...

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Rear hub changing, related questions...

Old 06-06-17, 05:21 PM
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Troul
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Rear hub changing, related questions...

Rear hub that I'm eyeing up is the Shimano Deore XT FHM756L.

Wheel being fitted with the above hub is the stock Bontrager AT750 double walled 32 hole wheel fitted with the
Shimano HG31 11-32 cassette & 160mm rotor.

Any insight as to what I should be expecting regarding spokes? Has this been done and the spokes needed are already identified for procuring them right the first time?





Thanks Bikeforums!
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Old 06-06-17, 05:27 PM
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a little research should turn up a number of spoke calc type programs on the web. they run the gamit, IME, from useless to pretty good.

best to get ERD and spoke count of rim and a couple of measurements WRT the hub. spoke hole diameter, number of spokes, flange offset from center of OLD. it will become apparent what is needed when perusing spoke calc websites.
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Old 06-06-17, 06:00 PM
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What I've found on the hub-

Light alloy QR lever and nut
Model Number: FH-M756
Series: Deore XT
Over Locknut Dimension: 135mm
Spoke Holes: 32H
Spoke Interface: J-Bend
Cassette Compatibility: Shimano/SRAM 8/9-Speed Mountain
Center to Flange: 20mm R / 33.5mm L
Flange Diameter: 61mm R / 61mm L
Brake Compatibility: 6-Bolt Disc
Quick Release (QR): Yes (included)


Wheel info that I have and could find is just the "Bontrager AT750 double walled 32 hole"
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Old 06-06-17, 07:47 PM
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Why? the Shimano 756 nice as they are, are very heavy hubs, add to that, you will need to rebuild the whole wheel, if you really want to get a wheel with a 756, would keep your Bonty wheel as is/sell it, and get a complete wheel built round the 756/buy a new rim/spokes (you would need these for a rebuild anyway) and build it round a 756..
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Old 06-06-17, 08:06 PM
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There's a good chance your existing hub is similar enough to the new hub that you can use the same length spokes.
Measure the PCD of the spoke holes and compare. You can fabricate a simple 'notch" gauge out of a piece of cardboard.
CTF dimensions won't be that far off. They only affect spoke length in a ratio of about 10:1. 10mm CTF difference = about 1mm spoke length.
Shop around. Often you can buy a complete wheel for less than the cost of individual parts.
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Old 06-07-17, 01:12 AM
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Originally Posted by Troul View Post
What I've found on the hub-

Light alloy QR lever and nut
Model Number: FH-M756
Series: Deore XT
Over Locknut Dimension: 135mm
Spoke Holes: 32H
Spoke Interface: J-Bend
Cassette Compatibility: Shimano/SRAM 8/9-Speed Mountain
Center to Flange: 20mm R / 33.5mm L
Flange Diameter: 61mm R / 61mm L
Brake Compatibility: 6-Bolt Disc
Quick Release (QR): Yes (included)


Wheel info that I have and could find is just the "Bontrager AT750 double walled 32 hole"
that should be enough info for most of the spoke calc's i've used on the internet.
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Old 06-07-17, 01:23 AM
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Originally Posted by jimc101 View Post
Why? the Shimano 756 nice as they are, are very heavy hubs, add to that, you will need to rebuild the whole wheel, if you really want to get a wheel with a 756, would keep your Bonty wheel as is/sell it, and get a complete wheel built round the 756/buy a new rim/spokes (you would need these for a rebuild anyway) and build it round a 756..
I have the existing wheel with a questionable hub condition [Formula D branded] , have replacement spokes on hand for that same wheel with suspect hub, I'd just need to order that new hub which is about 40-50 USd shipped. Factor in another 30-50 to have the lbs spec the wheel once I assemble it. Most cost effective route I can see right now.

A new wheel assembly would cost at minimum 150, and it might be no better in reliability then the Formula brand that it is now.
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Old 06-07-17, 05:39 AM
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Sounds as if you are committed to a plan and are good to go. Let us know how it turns out.
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Old 06-07-17, 10:26 AM
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Originally Posted by shelbyfv View Post
Sounds as if you are committed to a plan and are good to go. Let us know how it turns out.
Not fully committed, have yet to pick up the hub and then set aside funds for lbs services. Until that is able to be justified, I'd need to ensure these parts all will marry together without any issues.
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