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Spoke length help :/

Old 07-22-20, 05:48 AM
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imi
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Spoke length help :/

Hi, I'm trying to understand various spoke-calculator sites, but seem to trip up before arriving at my goal!
Could a kind soul out there help me out?

REAR WHEEL for rim brakes
Rim: Mavic A719, 36 hole
Hub: Shimano Deore FH-T610 (36 hole)

Thanks!
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Old 07-22-20, 01:56 PM
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This is the best I have found. https://www.sheldonbrown.com/rinard/spocalc.htm He didn't have that hub, but I think I have found the dimensions at shimano's site. 38mm for the bolt circle and 35.8 for the flange location for a spoke length of 292.1 mm. If you have the hub double check the dimensions.
This was for 3 cross.

Sorry about the dimensions for a front wheel. I forgot that the FH in shimano's description means freehub.

Last edited by davidad; 08-06-20 at 12:04 PM. Reason: error
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Old 07-22-20, 02:19 PM
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More DIY..

Remaining Work _You do.. need the ERD & the hub's spoke hole circle diameter.

tool bought: a measuring Caliper... digital readout is one kind

ERD can be measured with 2 spokes, hung opposite from each other in the rim. nip threaded as it would be, finished..

you measure the gap between them with your caliper ... + the length of those 2 spokes.

caliper can measure that hub hole diameter too

now you have numbers to plug into the rest of the calculation



...

Last edited by fietsbob; 07-22-20 at 02:29 PM.
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Old 07-22-20, 02:24 PM
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How many crosses?
What size rim? Bike wheels come in multiple diameters.
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Old 07-23-20, 05:25 AM
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I'm math averse and share your intimidation by spoke calculators. If you order from BikeHubStore they will figure for you, but no guarantee if they get it wrong.
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Old 07-23-20, 06:18 AM
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I use https://www.wheelpro.co.uk/spokecalc/ There is help available by clicking on any heading and guides to help you measure your chosen components.
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Old 07-31-20, 12:30 PM
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Did you find the right size?
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Old 07-31-20, 03:36 PM
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Pro builder list the A719 with an ERD of 601, Mavic with 598. Last time I used three spoke calculators and selected the top two sizes, Still wound up needing an extra 1-2mm on the spokes so... check the other sites and check the assumptions listed. Make sure those are what you have for your stuff. Don't ASSUME these are correct.

ASSUMPTION: Wheel size, 700C, Mavic A719
ASSUMPTION: ERD of 598mm according to Mavic
ASSUMPTION: 3x cross
ASSUMPTION: 2.0-1.8-2.0 double butted spokes
ASSUMPTION: Hub Dimension according to Nashbar
Rear Axle QR x 135mm
Center to Flange, Right 23
Center to Flange, Left 33
Flange Diameter, Left 45.5
Flange Diameter, Right 45.5
With and ERD of 598:

ERD of 598

With an ERD of 601...


ERD of 601

Check these against a few other calculators...and the actual products in your hands.
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Old 08-04-20, 07:15 AM
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Wow! Thank you so much everybody! Sorry, I should have checked back to this thread earlier, but things have been a bit hectic.
Anyway, stay safe all, and thanks again!
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Old 08-04-20, 09:49 PM
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Originally Posted by bicynical View Post
I use https://www.wheelpro.co.uk/spokecalc/ There is help available by clicking on any heading and guides to help you measure your chosen components.
...I use that one, too. It has always worked well for the wheels I build here, but I mostly build old school wheels, with 120 and 126 OLD hubs, and regular rims that are not offset. A man's got to know his limitations.
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Old 08-06-20, 10:02 AM
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Since my question is about mavic rims I'll put that here. Newbie wheelbuilder here and I'm trying to build a single speed bikes wheels to mavic open elites.
Mavic open elite this is the rim in question. On the site, it says: Spoke bed diameter (ERD): 605 mm but also , when pressing the button for more information it says: ERD= spoke bed diameter + 2x nipple height. This I cannot comprehend because if erd is 605mm and also 605mm + 2 times nipple height? So would I put to the rim calculators 605 and add 4mm to the result I get?

prowheelbuilder.com/spokelengthcalculator Does not seem to have the rim. I do not have the rim yet as its still on its way from the store but it might be best to just wait and measure the dimensions from the rim itself, no?
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Old 08-06-20, 02:54 PM
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Originally Posted by Piggins View Post
Since my question is about mavic rims I'll put that here. Newbie wheelbuilder here and I'm trying to build a single speed bikes wheels to mavic open elites.
Mavic open elite this is the rim in question. On the site, it says: Spoke bed diameter (ERD): 605 mm but also , when pressing the button for more information it says: ERD= spoke bed diameter + 2x nipple height. This I cannot comprehend because if erd is 605mm and also 605mm + 2 times nipple height? So would I put to the rim calculators 605 and add 4mm to the result I get?

prowheelbuilder.com/spokelengthcalculator Does not seem to have the rim. I do not have the rim yet as its still on its way from the store but it might be best to just wait and measure the dimensions from the rim itself, no?
Mavic lists the ERD on their product webpages, use that number. You shouldn't have to add to it, so you would enter 605..

Now I will say it may help to measure your actual rim and not what the website has. But I wouldn't expect them to be more than 1mm away from each other if anything.
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