The wheelbuilding thread

Everything about building wheels, glueing tubs, etc.
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Beaver
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Joined: Wed Aug 18, 2004 6:06 pm

by Beaver

One quick question: What's the weight for 44 Sapim CX-Ray spokes (straight pull for 35mm high rims) and 44 Polyax nipples? Found 205g and 225g, what's right?

Marin
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Location: Vienna Austria

by Marin

In my wheel design spreadsheet 44 thin aero spokes come out as 198g, so I'd go with the lower figure.

by Weenie



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Beaver
Posts: 794
Joined: Wed Aug 18, 2004 6:06 pm

by Beaver

Luckily r2-bike weighs everything. :D

Image

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Edit: On their english site the picture of the CX Super was shown and not the CX Ray... :(

So it's 210g plus 15g - 225g is correct for 280mm CX-Ray straight pull spokes.

For 44 CX Super 280mm and nipples 190g:

Image
Last edited by Beaver on Fri Dec 07, 2018 4:00 pm, edited 3 times in total.

Marin
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Location: Vienna Austria

by Marin

Cool!

Timmy269
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Joined: Tue Nov 25, 2014 2:34 pm

by Timmy269

It looks like the braking surface of my DT Swiss RC spline 55 arre worn. I think that it can not be repared. Can I buy new rim and replace them? The hub an spokes are still in great condition?

Marin
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by Marin

Yes, 99.9% you'll need new spokes though

Timmy269
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by Timmy269

Marin wrote:
Mon Dec 17, 2018 9:20 am
Yes, 99.9% you'll need new spokes though
These are the hubs, I think they are DT Swiss 240.
To bad I can't find de rims of the ones I have.
Which carbon rim with the same height you recommand?
Image

Marin
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Location: Vienna Austria

by Marin

Light Bicycle will have 55s I think.

wolfesquire
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Joined: Wed Feb 09, 2011 3:03 am

by wolfesquire

I weigh 210lb/95.25kg and wanting to build a set of aluminum every day wheels and trying to keep it under $1,000. I live in a VERY flat area next to the beach .
Rims: Easton R 90 SL
Spokes: DT Swiss Competition (CX-Sprints?)
Hubs: DT Swiss 350
Nipples: brass
Skewers: KCNC Titanium Skewers

any suggestions to make this better? is 24/28 spokes enough or should I go 28/32?

Marin
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Location: Vienna Austria

by Marin

Under 1000? You can build 4 sets for that price!

Kinlin XR31, 2.0/1.8 buttes spokes, 24/28 should be enough if built well.

bm0p700f
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by bm0p700f

Timmy 269 they are not 240 hubs, they have 240 internals. The shell is different and DT Swiss spoke length calculator will not calculate the spoke lengtgs correctly for a rim of different erd.

In 290mm length a CX ray and alloy nipple is 5g eachm

Wolfesquire swap the DT hubs miche Primato, cheaper than DT hubs with no downsides.

You could use the kinlin XR26T or the 31t.

I do a set of the kinlin rims with Sapim aero spokes and the miche hubs and they cost around 500usd which just goes to show if you outside brand names you know you can build a gem.

Use the Easton rims though if you can get them cheap enough. They are nice but pricey in the UK.

Timmy269
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Joined: Tue Nov 25, 2014 2:34 pm

by Timmy269

bm0p700f wrote:
Fri Dec 21, 2018 11:33 pm
Timmy 269 they are not 240 hubs, they have 240 internals. The shell is different and DT Swiss spoke length calculator will not calculate the spoke lengtgs correctly for a rim of different erd.
So I have to measure the hubs myself and search for another calculator if I want to reuse the hubs?

bm0p700f
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by bm0p700f

Nope it's a straight pull hub. Spoke length calculator don't handle straight pull hubs. The DT Swiss calculator is setup for the aftermarket hubs only. You cannot assume that the ones in there wheels are the same. Some DT wheels use 1x lacing for start.

The way I do spoke length for straight pull builds is guess. I work out through experience what lengths are required. When I have it right I then use spocalc to work out the fractional crissing. Only then can I determine the correct spoke length for a different rim without thetefious process if guessing. Even then some fine tuning if spoke lengths us sometimes needed

bm0p700f
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by bm0p700f

If the old wheelset is still built up. Remove spokes and measure there length. Then use spoke cLC to determine the fraction crossing using the red measured using nipples from the wheel. Then forward calculate using the new rim red measured using the nipples you are going to use in the new set. Your new nipples are probably different to the thing DT use in there wheels.

by Weenie


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