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PostPosted: Mon Sep 17, 2012 2:27 pm 
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Joined: Mon Jul 16, 2012 7:32 pm
Posts: 16
Can somebody tell be is the older (lighter) Alpha 340 rim left or right handed drilling?
..And how about the newwer one?

I'm thinking now where the key spoke goes. So that's pretty important.


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PostPosted: Mon Sep 17, 2012 4:22 pm 
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Joined: Fri May 21, 2010 3:08 am
Posts: 323
Location: Milton, Canada
I have the old and new Alpha 340's (had an old one crack at the eyelets). The spoke holes on both seem to be dead right down the middle with no offset that I can perceive.


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PostPosted: Tue Sep 18, 2012 9:13 pm 
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Location: Mårslet, Denmark
Looking for a black straight pull Sapim CX spoke in 292mm length as used on the rear DS on a Campagnolo Neutron Ultra wheel. No retailer seems to have these 2.8 mm wide aero anymore. I can only find the mini spoke kit from Campagnolo, but only need that one spoke.

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PostPosted: Tue Sep 18, 2012 11:09 pm 
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Location: Glermsford, Suffolk U.K
In the U.K spaim stright pulls are special order only through the distributor. they don't stock them. Bite the bullet and by the kit. More spokes might go.

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PostPosted: Thu Sep 20, 2012 9:59 pm 
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So I'm going to be building a triplet rear wheel using a BHS SL211. I'm just a little bit confused about the SCC part of Jeremy's formula. SCC is defined as spoke circle diameter multiplied by pi. Is the spoke circle diameter the distance from centre to centre of opposite spoke holes?

Thanks for any help.

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PostPosted: Thu Sep 20, 2012 10:58 pm 
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Location: Glermsford, Suffolk U.K
I interpreted the same way you have. It spits out sensible results that way.

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PostPosted: Fri Sep 21, 2012 7:55 am 
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Joined: Mon Jan 03, 2011 6:42 pm
Posts: 42
Looking at getting a set of wheels built up. Thinking Ambrosio Crono F20, Record 32H hubs and DT Revs as spokes.

A few questions
1. Are the DT Revs a bad idea, esp on DS rear? Mainly going for them because they are much cheaper than the CX-Rays
2. What cross on these? 2x front 3x back?
3. Was considering the Nemesis but would that be overkill for me and my 62kg frame? I don't exactly ride Pave (but do race Irish roads)

Thanks


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PostPosted: Fri Sep 21, 2012 8:52 am 
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bm0p700f wrote:
I interpreted the same way you have. It spits out sensible results that way.


Where I'm getting confused is that in the example I saw, the flange diameter wasn't multiplied by pi and it produces a difference of over 1mm

For example the plan is to lace a Stans Alpha 340 to the SL211. ERD is 593, flange diameter is 49.3 and spacing is 16.75. For 48x5 DT Spoke Calc gives a 290.2mm spoke length. From my understanding of Jeremy's formula to get the adjustment for triplet you do:

290.2 - (49.3*pi)*0.0104

However following the example it would be:

290.2 - 49.3*0.0104

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PostPosted: Fri Sep 21, 2012 11:22 am 
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Location: Glermsford, Suffolk U.K
Euan as I have never done it I cannot say for sure. The latter calc gives a result closer to Mackers method of 2.3 or 3.4x fro2x or 3x wheels.

Diarmudic 3x lacing for 32H please. Rev's will be fine I am running a set of 28H RR415 with Sapim Lasers all round and they are fine. However there is alittle bit of flex when standing up and putting out some torque. The use of 2.0/1.8/2.0mm spokes DS helps cure that problem and leads to a durable rear wheel. You could try ACI's 2.0/1.7/2.0mm spokes or Sapims D-light 2.0/1.65/2.0mm spokes for greater stiffness over revs/lasers.

I would use Sapim spokes as they are cheaper than DT spokes and ust as good and Race DS and Lasers NDS is a combination that works well.

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PostPosted: Fri Sep 21, 2012 12:41 pm 
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So far I've used three different methods and have got values ranging from 287 up to 289. Fun fun fun.

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PostPosted: Fri Sep 21, 2012 1:00 pm 
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Location: Glermsford, Suffolk U.K
Then use 288mm and all will be well I hope.

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PostPosted: Fri Sep 21, 2012 3:50 pm 
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Location: Slovenia---that forest land
Question about lacing patteren

Why some wheels didnt have standard over-under patteren (at 2x cross)?
just under- under or over- over

Or for straight pull spokes that is not important (like Campagnolo Bora 2)?

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PostPosted: Fri Sep 21, 2012 6:06 pm 
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Location: Glermsford, Suffolk U.K
My understanding is the under over or over under crossing was to brace the spokes to help prevent unwinding and improve wheel stiffness. I cannot see however how it does either. I have always built under-over/over-under beause I think it looks better.

I cannot see any good reason why laing under under or over over would not work as well.

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PostPosted: Fri Sep 21, 2012 7:20 pm 
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Location: Slovenia---that forest land
spoke is virtualy shorter - but has any effect on stiffnes?
like tideing and soldering at crossing - i didnt try but it has no effect on stiffnes ( prowheelbuilders internet book)

unwinding is problem mostly at NDS where spokes mostly are radial

i got better feeling with over under (or under over) than over over or under under - when put tension on spokes

at crossing they just " glue" togehter :)

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PostPosted: Fri Sep 21, 2012 9:06 pm 
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Joined: Tue Nov 11, 2003 9:47 pm
Posts: 2141
Location: Santa Cruz, California, USA
On the rear it makes a difference which way the pulling spokes go. If the last cross has the pulling spoke on the outside (head out), tension on it will pull the spokes inward. If it's on the inside (head in), tension on the pulling spoke will pull the spokes outward. That reduces clearance between the spoke and derailleur cage.

I read somewhere that Mavic did an experiment on their pro neutral support wheels, lacing them each way and recording what happened. They found that the heads in lacing for pulling spokes made more reliable wheels. I wish I could find that reference again.

I've done both and haven't noticed a difference, but since I only build wheels for myself my sample size is too small.


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