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Old 10-08-2005, 01:05 AM   #1
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Wheel building
I need to find out the right spoke length for the wheel i am going to build. I know the ERD is 532mm but i dont know the specs of my hub. It is a slightly older XT rear hub, model number FH-M756. I tried looking on the internet for a database of hubs, but i could not find one with this hub. So i guess im gonna have to use a spoke lenth calculator (which needs the specs of his hub to be used)

ERD= 532
Hub model number= FH-M756
Spoke length=????

Any kind of help you can offer is apreciated!
Last edited by Chunk; 10-08-2005 at 01:17 AM.
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Old 10-08-2005, 02:11 AM   #2
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http://www.dtswiss.com/index.asp

(spoke calculater)
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Old 10-08-2005, 04:31 AM   #3
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Quote:
Originally Posted by Chunk
ERD= 532
Hub model number= FH-M756
Spoke length=????

Any kind of help you can offer is apreciated!
Here is the info for a 36 hole wheel.

4 cross:
LF side 263.1mm
RT side 261.8mm

3 cross:
LF side 252.9mm
RT side 251.5mm

Hub specs:

FL dia (both) 61.0mm
Center to LF 32.2mm
Center to RT 18.5mm
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Last edited by Salami; 10-08-2005 at 03:27 PM. Reason: Important info left out
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Old 10-08-2005, 10:00 AM   #4
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Quote:
Originally Posted by Salami
4 cross:
LF side 263.1mm
RT side 261.8mm

3 cross:
LF side 252.9mm
RT side 251.5mm

Hub specs:

FL dia (both) 61.0mm
Center to LF 32.2mm
Center to RT 18.5mm
Wow salami, thanks a ton! This will be my first time building a wheel so i want everything to be perfect. BTW, how did you know the specs? where did you get them?
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Old 10-08-2005, 01:32 PM   #5
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http://bikeparts.com/search_results.asp?ID=SH30681

They have the specs as:
flange diameter: 61mm
center to flange: 31.7mm left, 21.1mm right

That would give you 256.7 left, 255.6 right.


http://www.dtswiss.com/spokescalc/Calculator.aspx
DT Swiss have the specs as:
flange diameter: 61mm
center to flange: 32.15mm left, 18.55mm right

That would give 256 left, 255 right.
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Old 10-08-2005, 03:41 PM   #6
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Quote:
Originally Posted by Chunk
Wow salami, thanks a ton! This will be my first time building a wheel so i want everything to be perfect. BTW, how did you know the specs? where did you get them?
No problem. Building wheels is a lot of fun until your good friends find out you are good at it and ask you to build them for free.
Go here to get the program I used: http://www.damonrinard.com/spocalc.htm

Download the Spocalc (full strength version). It has a database for a lot of hubs and rims. I found it there. Since a lot of the hubs and rims are more XC oriented I have added some of the hubs and rims I have built to my database. You will need to have Microsoft Excel to run the porgram.

BTW I edited my above post. I was very tired when I ran the calculations and forgot to ask how many hole rims. Switch's numbers are correct for a 32 hole 3 cross if that is what you are building.
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Old 10-08-2005, 10:39 PM   #7
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oh yea haha, i forgot to put the spoke count as well, 32 hole.

Thanks alot for all of your guys' help. Wish me luck!
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Old 10-09-2005, 03:01 AM   #8
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Spokecalc is an excellent tool, but it hasn't been updated in quite some time (i.e. it didn't have the 756 hub in it).
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Old 10-09-2005, 04:08 AM   #9
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yea, i used the DT swiss site and i just ordered some spokes and nipples!
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Old 10-09-2005, 04:11 AM   #10
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3 or 4 cross, whats diff?
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Old 10-09-2005, 04:43 AM   #11
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The amount of crosses is determined by how many times a spoke on one flange crosses other spokes on the same flange. So look at a spoke on your bike, and see how many times it crosses over or under other spokes on the same flange as it.

4 cross has just a teeny bit more strength with the pedaling and braking forces. And on a 3 cross it is alot easier to replace a broken spoke so. 3 cross is quite a bit more common though.
Last edited by Chunk; 10-09-2005 at 04:56 AM.
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Old 10-09-2005, 04:52 AM   #12
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I built myself a 36 hole 4X wheel using a standard XT hub wrapped in a Singletrack rim. It's taken two seasons of ht downhilling in Whistler, so I'm all for the 4X!

Apparently a 36 holse 4X design is stronger because the forces applied to it are dissapated more because the 4X is more tangential (root: tangent) than 3X. I don't really know what that means though...
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Old 10-09-2005, 06:39 AM   #13
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Quote:
Originally Posted by StrawDog
I built myself a 36 hole 4X wheel using a standard XT hub wrapped in a Singletrack rim. It's taken two seasons of ht downhilling in Whistler, so I'm all for the 4X!

Apparently a 36 holse 4X design is stronger because the forces applied to it are dissapated more because the 4X is more tangential (root: tangent) than 3X. I don't really know what that means though...
yea, i heard that it doesnt make a HUGE difference though. Im sure it helped some, but not a ton. The biggest factor in a wheel is the build. A quality build with crappy parts can last just longer than some high ent stuff with an OK build.
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Old 10-09-2005, 08:49 AM   #14
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4x is more common on 36+ hole hubs. 32 hole hubs should use 3x.
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Old 10-09-2005, 09:39 AM   #15
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i build wheels for cheap and have got very good feedback on my skills anyone need any pm me if ur in the area
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