GoldenMotor.com Forum
General Category => Magic Pie & Smart Pie Discussions => Topic started by: Tamb on January 17, 2022, 02:46:52 AM
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Hello,
According to the earlier threads I've read
https://goldenmotor.com/SMF/index.php?topic=2480.0
https://goldenmotor.com/SMF/index.php?topic=6878.0
My wheel has spokes which are 110mm from the elbow to tip and 2.5mm thick.
I have two broken spokes that I'd like to replace, ideally without replacing the nipples
I wonder if these will fit the existing nipples
https://www.bicyclespokes.com.au/shop-1/p/8yzbf8ivibzo3vsxxfr5u05fp9w9at-fphak
These Sapim Strong 13/14 have been recommended, but I assume that they would need new nipples
https://www.bicyclespokes.com.au/shop-1/p/sapim-strong-14-gauge-j-bend
Thanks a lot for your advice
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Hi Tamb and(https://i.imgur.com/evDSMvT.png)to the forum.
The GM 26" MPII, MPIII, MP4 and MP5 wheels all use the same spokes:
(http://www.arhservices.co.uk/GoldenMotor/MPIIspoke.JPG)
The Sapim Leader 13G spokes should fit your original nipples, but the Sapim Strong 13/14G butted spokes would require the smaller 14G nipples to suit the smaller thread:
(http://www.arhservices.co.uk/GoldenMotor/Sapim%2013-14g%20butted%20strong%20spoke.jpg)
As you are only planning to replace two spokes, I suggest that you use the 13G (non-butted) thicker diameter spokes (https://www.bicyclespokes.com.au/shop-1/p/8yzbf8ivibzo3vsxxfr5u05fp9w9at-fphak) which are more comparable to your existing spokes and should use the same nipples.
However, if you were rebuilding the wheel using a standard 36 hole bicycle rim using all new spokes, I would recommend using the 13/14G butted spokes with 14G nipples.
Please note that fitting a different rim may require different length spokes if the rim depth is different.
Alan
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Hi Tamb and(https://i.imgur.com/evDSMvT.png)to the forum.
The GM 26" MPII, MPIII, MP4 and MP5 wheels all use the same spokes:
(http://www.arhservices.co.uk/GoldenMotor/MPIIspoke.JPG)
The Sapim Leader 13G spokes should fit your original nipples, but the Sapim Strong 13/14G butted spokes would require the smaller 14G nipples to suit the smaller thread:
(http://www.arhservices.co.uk/GoldenMotor/Sapim%2013-14g%20butted%20strong%20spoke.jpg)
As you are only planning to replace two spokes, I suggest that you use the 13G (non-butted) thicker diameter spokes (https://www.bicyclespokes.com.au/shop-1/p/8yzbf8ivibzo3vsxxfr5u05fp9w9at-fphak) which are more comparable to your existing spokes and should use the same nipples.
However, if you were rebuilding the wheel using a standard 36 hole bicycle rim using all new spokes, I would recommend using the 13/14G butted spokes with 14G nipples.
Please note that fitting a different rim may require different length spokes if the rim depth is different.
Alan
Thanks a lot for your help. I bought the suggested spokes and fitted them easily enough.
I've since broken another spoke (only a couple of rides). Any ideas why they are breaking so frequently? I have a lot of spares now but still - would be good to know how to avoid it!
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If your spokes are all breaking on the elbow section like this:
(http://1.bp.blogspot.com/_gA93NEz9L84/R6YKyvuqJDI/AAAAAAAAA60/PBHnjHc387c/s1600/DSC_3492+%28Medium%29.JPG)
It's because the spokes are failing due to metal fatigue caused by the constant flexing of the elbow as the spokes are not correctly supported at the flange end.
I suggest you read the following posts to find out why this happens, and how to prevent it from happening again:
Why spokes break. (http://goldenmotor.com/SMF/index.php?topic=3187.msg19243;topicseen#msg19243)
The best way to prevent spokes from breaking. (http://goldenmotor.com/SMF/index.php?topic=3746.msg25508;topicseen#msg25508)
Alan