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-   -   Rim recommendation? (https://www.bikeforums.net/bicycle-mechanics/1232299-rim-recommendation.html)

Kermit1945 06-08-21 06:49 PM

Rim recommendation?
 
Iím planning to build mid-motor e-bikes for myself and my other, and it occurs to me to ask about rim type/design. Recreational use, no gravel/off-road or cargo. Is there a best choice? Something to avoid? Planning to use 700x35 tires. Oh, not using rim brakes. Haven't built wheels since my youth (decades back) so advice is welcome. Asked in Electric Bikes section; it was suggested to crosspost here. Thanks!

Kimmo 06-08-21 07:53 PM

Velocity has a couple of off-centre designs that might suit your purpose.

I'd be keen on going OCR to get some free strength in the wheels.

Bill Kapaun 06-08-21 07:58 PM

This would be my choice for a solid, lower cost, meat & potatoes rim.
https://www.treefortbikes.com/Sun-Ri...-Rim-29er-700c
How many spokes?

Kermit1945 06-08-21 09:06 PM

36 spoke minimum, I’m thinking.
Interesting. I was looking at that same rim.

Rick 06-08-21 09:14 PM

Ryde Andra 30 or Ryde Andra 40 rims are the strongest and most likely the heaviest rims available.

adipe 06-09-21 03:36 AM


Originally Posted by Bill Kapaun (Post 22094025)
This would be my choice for a solid, lower cost, meat & potatoes rim.
https://www.treefortbikes.com/Sun-Ri...-Rim-29er-700c
How many spokes?

6061-T6 aluminum

solid choice but be aware (the op should be) that it's a low profile rim (15.5 mm) so you really should go with thinner spokes on the side where there is less tension. low profile rims will deflect (referring to radial, not so much torsional/lateral) more under load and you need to ensure the spokes don't approach zero tension because of that deflection. you could go with 2mm DS and 1.8mm NDS; if the wheel builder is skilled enough then it might make sense to go with even less than that. the thinner the spokes the more stretch under tension and also more torsional stress/strain. and by the way... the more residual torsional stress on the DS spokes the higher the risk of spoke (nipple) pull through the rim for a high enough tension.

i could go with 1.8mm DS and 1.5mm NDS on such a low profile rim but i would not recommend it for the average joe builder.

the other rims mentioned in that later post are 6063 aluminum (which is roughly 66% the strength of the 6061-T6 alloy) so they are crappier (at least heavier) although they seem to be more forgiving on the lack of skills and knowledge for wheel building compared to those sun rhyno.


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