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Recommended Spoke Tension for DT Swiss XR 4.1d rim



 
 
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  #1  
Old September 9th 07, 08:26 AM posted to rec.bicycles.tech
tiborg
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Posts: 65
Default Recommended Spoke Tension for DT Swiss XR 4.1d rim

I want to build a rear wheel using a DT Swiss XR 4.1d rim and 32
Alpine III spokes. Does anyone have handy DT Swiss's recommended spoke
tension for this rim? They don't seem to have that information on
their website.

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  #2  
Old September 9th 07, 12:50 PM posted to rec.bicycles.tech
steve
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Posts: 86
Default Recommended Spoke Tension for DT Swiss XR 4.1d rim

On Sep 9, 3:26 am, tiborg wrote:
I want to build a rear wheel using a DT Swiss XR 4.1d rim and 32
Alpine III spokes. Does anyone have handy DT Swiss's recommended spoke
tension for this rim? They don't seem to have that information on
their website.


According to DT all of their rims have a max tension of 120kg which is
a bit higher than most recommended spoke tensions for rims. If your
hub has a lot of dish in it and you are a larger rider then I would
probably approch the 120kg mark otherwise you would be fine if you
stayed at 110kg which would put less stress on the rim. Good luck.

Steve

  #3  
Old September 9th 07, 01:54 PM posted to rec.bicycles.tech
Qui si parla Campagnolo-www.vecchios.com Qui si parla Campagnolo-www.vecchios.com is offline
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Posts: 933
Default Recommended Spoke Tension for DT Swiss XR 4.1d rim

On Sep 9, 1:26 am, tiborg wrote:
I want to build a rear wheel using a DT Swiss XR 4.1d rim and 32
Alpine III spokes. Does anyone have handy DT Swiss's recommended spoke
tension for this rim? They don't seem to have that information on
their website.


100 kgf on the right side rear and front. The same for any spoke, any
rim, generally.

  #4  
Old September 9th 07, 04:12 PM posted to rec.bicycles.tech
tiborg
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Posts: 65
Default Recommended Spoke Tension for DT Swiss XR 4.1d rim

On Sep 9, 8:50 pm, steve wrote:
On Sep 9, 3:26 am, tiborg wrote:

I want to build a rear wheel using a DT Swiss XR 4.1d rim and 32
Alpine III spokes. Does anyone have handy DT Swiss's recommended spoke
tension for this rim? They don't seem to have that information on
their website.


According to DT all of their rims have a max tension of 120kg which is
a bit higher than most recommended spoke tensions for rims. If your
hub has a lot of dish in it and you are a larger rider then I would
probably approch the 120kg mark otherwise you would be fine if you
stayed at 110kg which would put less stress on the rim. Good luck.

Steve


Thanks.
For the hub, I'll be getting a Shimano FH-M765 (35.8/24.8 center to
flange).
I'm about 75kg and have a seatpost rack loaded from 5 to 10kg. The
wheel is going on my full suspension commuter which I take over some
fairly poor roads, so it's going to take some hits.

  #5  
Old September 9th 07, 04:20 PM posted to rec.bicycles.tech
tiborg
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Posts: 65
Default Recommended Spoke Tension for DT Swiss XR 4.1d rim

On Sep 10, 12:12 am, tiborg wrote:
On Sep 9, 8:50 pm, steve wrote:

On Sep 9, 3:26 am, tiborg wrote:


I want to build a rear wheel using a DT Swiss XR 4.1d rim and 32
Alpine III spokes. Does anyone have handy DT Swiss's recommended spoke
tension for this rim? They don't seem to have that information on
their website.


According to DT all of their rims have a max tension of 120kg which is
a bit higher than most recommended spoke tensions for rims. If your
hub has a lot of dish in it and you are a larger rider then I would
probably approch the 120kg mark otherwise you would be fine if you
stayed at 110kg which would put less stress on the rim. Good luck.


Steve


Thanks.
For the hub, I'll be getting a Shimano FH-M765 (35.8/24.8 center to
flange).
I'm about 75kg and have a seatpost rack loaded from 5 to 10kg. The
wheel is going on my full suspension commuter which I take over some
fairly poor roads, so it's going to take some hits.


I looked up the wrong specs on the hub, it's in fact a 35.35/20.05
center to flange.

  #6  
Old September 10th 07, 02:26 AM posted to rec.bicycles.tech
steve
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Posts: 86
Default Recommended Spoke Tension for DT Swiss XR 4.1d rim

On Sep 9, 11:20 am, tiborg wrote:
On Sep 10, 12:12 am, tiborg wrote:





On Sep 9, 8:50 pm, steve wrote:


On Sep 9, 3:26 am, tiborg wrote:


I want to build a rear wheel using a DT Swiss XR 4.1d rim and 32
Alpine III spokes. Does anyone have handy DT Swiss's recommended spoke
tension for this rim? They don't seem to have that information on
their website.


According to DT all of their rims have a max tension of 120kg which is
a bit higher than most recommended spoke tensions for rims. If your
hub has a lot of dish in it and you are a larger rider then I would
probably approch the 120kg mark otherwise you would be fine if you
stayed at 110kg which would put less stress on the rim. Good luck.


Steve


Thanks.
For the hub, I'll be getting a Shimano FH-M765 (35.8/24.8 center to
flange).
I'm about 75kg and have a seatpost rack loaded from 5 to 10kg. The
wheel is going on my full suspension commuter which I take over some
fairly poor roads, so it's going to take some hits.


I looked up the wrong specs on the hub, it's in fact a 35.35/20.05
center to flange.- Hide quoted text -

- Show quoted text -


With that hub I think you would be fine at a tension of 100kg-110kg.
The disc hubs move the non-drive flange in a bit to make room for the
disc which will allow tensions to be more even between drive and non-
drive.

Steve

  #7  
Old September 10th 07, 03:23 AM posted to rec.bicycles.tech
Chalo
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Posts: 5,093
Default Recommended Spoke Tension for DT Swiss XR 4.1d rim

Qui si parla Campagnolo wrote:

100 kgf on the right side rear and front. The same for any spoke, any
rim, generally.


That's a relatively safe generalization, but it doesn't make much
sense from an engineering perspective. A 32 hole downhill rim
weighing 900g and laced with 13-14ga spokes should have a much higher
per-spoke tension than a 48 hole touring rim weighing 480g and laced
with 15-16ga spokes.

I know you build a lot of 32 and 36 spoke road bike wheels with
400-500g rims and 14-15ga butted spokes, and 100kgf per spoke is good
for that kind of wheel. But some wheels must have less tension and
others benefit from more tension.

Chalo

  #8  
Old September 10th 07, 05:09 AM posted to rec.bicycles.tech
jim beam
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Posts: 5,758
Default Recommended Spoke Tension for DT Swiss XR 4.1d rim

Chalo wrote:
Qui si parla Campagnolo wrote:
100 kgf on the right side rear and front. The same for any spoke, any
rim, generally.


That's a relatively safe generalization, but it doesn't make much
sense from an engineering perspective. A 32 hole downhill rim
weighing 900g and laced with 13-14ga spokes should have a much higher
per-spoke tension than a 48 hole touring rim weighing 480g and laced
with 15-16ga spokes.

I know you build a lot of 32 and 36 spoke road bike wheels with
400-500g rims and 14-15ga butted spokes, and 100kgf per spoke is good
for that kind of wheel. But some wheels must have less tension and
others benefit from more tension.

Chalo


how does that makes sense? spoke tension is simply that required to
prevent the spokes going slack in use - increasing tension does not
increase wheel strength or stiffness. and spoke slackening in use is
simply a function of the rim deforming at the loading point - a stronger
rim will deform less and thus require less tension, all loads being equal.
  #9  
Old September 10th 07, 09:49 AM posted to rec.bicycles.tech
Rik O'Shea
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Posts: 75
Default Recommended Spoke Tension for DT Swiss XR 4.1d rim

On 9 Sep, 13:54, "Qui si parla Campagnolo-www.vecchios.com"
wrote:
On Sep 9, 1:26 am, tiborg wrote:


100 kgf on the right side rear and front. The same for any spoke, any
rim, generally.


"right side rear" - Do you mean the rear drive side or non-drive side?

  #10  
Old September 10th 07, 11:10 AM posted to rec.bicycles.tech
Chalo
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Posts: 5,093
Default Recommended Spoke Tension for DT Swiss XR 4.1d rim

jim beam wrote:

Chalo wrote:

Qui si parla Campagnolo wrote:
100 kgf on the right side rear and front. The same for any spoke, any
rim, generally.


That's a relatively safe generalization, but it doesn't make much
sense from an engineering perspective. A 32 hole downhill rim
weighing 900g and laced with 13-14ga spokes should have a much higher
per-spoke tension than a 48 hole touring rim weighing 480g and laced
with 15-16ga spokes.


I know you build a lot of 32 and 36 spoke road bike wheels with
400-500g rims and 14-15ga butted spokes, and 100kgf per spoke is good
for that kind of wheel. But some wheels must have less tension and
others benefit from more tension.


how does that makes sense? spoke tension is simply that required to
prevent the spokes going slack in use - increasing tension does not
increase wheel strength or stiffness.


Right. But bigger loads-- static or dynamic-- require more spoke
tension to support them.

and spoke slackening in use is
simply a function of the rim deforming at the loading point - a stronger
rim will deform less and thus require less tension, all loads being equal.


But all loads are not equal, which is why M/Cs get thicker spokes and
higher tensions to go along with their stiff and heavy rims. Heavy
riders and those who lay a beating on their bicycles require analogous
measures.

Chalo

 




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