Bicycle Mechanics - Spoke length weirdness

Hi guys,

I'm about to start my first wheelbuild. I disassembled the existing wheels and kept all the spokes in 3 labeled bundles from the front wheel, rear drive side, and rear non-drive side.

I have measured the existing spokes again and again to try to determine the size spokes I need to order, and I keep getting 308mm... on all of them. Whether they're from the front, or either rear side. This is from a wheel on an old 10 speed with a 5 speed freewheel. (27" Fiamme yellow clincher rims, large flange Campagnolo "nuovo tipo" hubs)

Shouldn't the rear wheel spokes be different on the different sides due to the dish? I'm a little confused here. Thanks for any light you can shed on this.

wide flange Campagnolo ?? big difference between wide flange and high flange... for me wide flange are track hubs so wouldn't surprise me u got equal spokes for everything.

This is what I get using the right stuff.. if the store has 2 mms shorter it wont make that big of a difference., Enjoy. Put the numbers somewhere else tho, just to be sure.


Hub: Campagnolo all 126mm hi-flange models, rear
Rim: Fiamme Ergal (Yellow Label)
Number of spokes: 36
Crosses: 3
Spoke length left: 294.2
Spoke length right: 292.8


Hub: Campagnolo all hi-flange models, front
Rim: Fiamme Ergal (Yellow Label)
Number of spokes: 36
Crosses: 3
Spoke length left: 294
Spoke length right: 294

Sorry, wrong term I guess. Velobase calls it "large flange". It's these hubs: http://www.velobase.com/velobase.com/ViewComponent.aspx?ID=B30B0713-8C02-47FA-B8D8-8DB2C57D0223&Enum=110&AbsPos=1

36 hole, and 4 cross lacing.

Where did you enter those numbers?

edit: also I think the Fiamme yellow ergal rims are not the same ones I have... I think mine are the "professional" model, based on the labels shown on Velobase: http://www.velobase.com/ViewComponent.aspx?ID=F300EFD1-713C-43A6-8915-D207E574C997&Enum=107&AbsPos=5

Thanks!

4x? easy... based on this i would pick everything in 305. Where I got this? secret :D Just pull spoke calculation at google, bunch of tables and stuff, since I get 305 and u 308 I would go to another site to just be sure, 3 mm is too much difference.

Hub: Campagnolo all 126mm hi-flange models, rear
Rim: Fiamme Ergal (Yellow Label)
Number of spokes: 36
Crosses: 4
Spoke length left: 305.4
Spoke length right: 304


Hub: Campagnolo all hi-flange models, front
Rim: Fiamme Ergal (Yellow Label)
Number of spokes: 36
Crosses: 4
Spoke length left: 305.2
Spoke length right: 305.2

U might need this too, just wonder if there is a difference in the ERD for that rim but pretty much all the stuff back in the day was 617 to 620

Fiamme Ergal (Yellow Label)

ERD: 617
OSB: 0
Size: 700C


Campagnolo all hi-flange models, front

Right flange ø: 67
Left flange ø: 67
Centre to right flange: 34
Centre to left flange: 34
Spoke hole ø: 2.3

Campagnolo all 126mm hi-flange models, rear

Right flange ø: 67
Left flange ø: 67
Centre to right flange: 21
Centre to left flange: 36
Spoke hole ø: 2.3

Thanks for all the help, you are awesome!

The only thing that worries me, is the rim is not the yellow fiamme ergal, it's the 27" yellow fiamme professional, which I can't seem to find on any of the spoke calculators... hmmm...

http://www.velobase.com/ViewComponent.aspx?ID=F300EFD1-713C-43A6-8915-D207E574C997&Enum=107&AbsPos=5

The rear hub is likely a 120 or 122mm hub folks...hence using same size spokes all around is okay...

Aiming for the screwdriver flat of the nipples:

Front 4X = 305.37

Rear Left 4X = 305.26
Rear Right 4X = 304.42

My guess is the original spokes had 12mm threading instead of 10mm threading...and the nipples (10mm) allowed a good 2-3mm of poke-through through the top of the nipples.

Very common back in the 60s and 70s...

=8-)

Thanks, MrRabbit. Yes, rear hub is 120mm according to Velobase. The length of the threaded area on the spokes varies a little but seems to be about 10mm typically, sometimes 9mm. The nipples are about 11mm long, but they have a raised head--a dome of about 1mm. These made noticeable bumps under the rim tape.

Are these single wall rims taking tires and tubes?

=8-)

Are these single wall rims taking tires and tubes?

=8-)

Hopefully!

U can measure the ERD and the hub distances with a caliper and stick that into any spoke calculator man... Sadly I have no idea whats the ERD for that rim and is not listed in any of the spreadsheets i have. sorry.

Thanks for all your help, I will try the manual measurement.

If they are single wall rims - in 27" - the ERD is 620mm to as much as 622mm. That would allow spoke lengths of 307.00mm and 308.00mm using 4 cross lacing.

=8-)

http://www.mrrabbit.net/wheelsbyflemingapplications.php

Grab the spreadsheet...the hubs are in the bottom third under pre-1994 hubs.

=8-)