PDA

View Full Version : spoke length calculator?



David Gooch
01-30-2014, 11:39 PM
I await the Feb 6 thru 10 arrival of my 20 inch rims and my 20mm hubs.
Any advise on how to buy the correct spoke length the first time.
I plan on using the tripple cross lace pattern.

BMX web sites seem to be selling a lot of 194mm spokes.

Gooch

darnthedog
01-31-2014, 12:10 AM
This calculator set you up base of brand of parts. http://www.prowheelbuilder.com/spokelengthcalculator/

This one your enter your own data from measuring the hub http://www.machinehead-software.co.uk/bike/spokes/spoke_length_calculator.html

Here is another simple one http://spokelength.com/

You can not go by what is popular unless you have the exact same rim and hub combination that matches. If your sure of the hub model and Rim model and it is covered by first calculator then you should be good to go. Otherwise I would wait till you get the parts and measure them your self. Sometime information can be gather via Google on dimensions. Then the other calculators come into play.
Hope this helps you can also Google Spoke length calculator and get hundreds if not thousand of others.

Good luck

Twinkle
01-31-2014, 04:38 AM
I must agree with DTD here just because 194 mm spokes are popular ( I remember using 194 to put e-hubs into 26" rims ) it does not mean they are right !!!!!!!!!!!

measure all the parameters and then calculate the spoke lenght 1 mm too short does not matter as the nipple will cope with that , last 4 wheels I built last week were 183 mm using Large flange hubs and standard single section rims 36 / 32 spoked 3x .

The fun comes building wheels with different size flanges and thus 2 different lengths of spokes , 2 piles with LONG/Small flange and SHORT/large flange reminds me where to put the spoke .

Bit of advice here Start building with the "goes inwards spoke " in first then start putting the goes out spokes after. This stops you bending the spokes so much during the build .
Dont forget to "lace" the spoke under /over the 3rd cross for strength and rigidity .


There is another thread started a couple of weeks ago with lacing patterns discussed in it , for disc braked front wheels I use the conventional 3x with the drive spokes ( outside ) reversed to normal practice as the disc brakes are doing the stopping and the forces are reversed

http://forum.atomiczombie.com/showthread.php/8542-Warrior-Front-Wheel-build-Left-Right-Trailing-Leading-Spokes?highlight=wheel+spokes

regards
emma