Magnum Peak 27.5 rear spokes.

Ken M

Well-Known Member
One of the issues with all rear hub motors (especially the larger diameter DD hub motors) is that the spokes tend to be bent at the tightening nipple. I was replacing spokes every 5000 miles on my hub motor ebike but I still loved the commuting performance of the motor. Usually one spoke would break followed by another a week or two later then another in a shorter time period (after 3 I would just replace all 3 but the next break would occur in less than 1000 miles and the cycle would repeat).

If the industry cared they could fix this very easily. For example the rim manufactures could improve the nipple seats such that they could tilt more for hub motor lacing.

I haven't had a chance to lace up a complete wheel with a rim that has been modified to verify that this indeed works but I will put info on EBR when I get around to this.

Has anyone else tried to fix this "weak spot" issue with hub motor wheels?
 

johnriggins410

New Member
One of the issues with all rear hub motors (especially the larger diameter DD hub motors) is that the spokes tend to be bent at the tightening nipple. I was replacing spokes every 5000 miles on my hub motor ebike but I still loved the commuting performance of the motor. Usually one spoke would break followed by another a week or two later then another in a shorter time period (after 3 I would just replace all 3 but the next break would occur in less than 1000 miles and the cycle would repeat).

If the industry cared they could fix this very easily. For example the rim manufactures could improve the nipple seats such that they could tilt more for hub motor lacing.

I haven't had a chance to lace up a complete wheel with a rim that has been modified to verify that this indeed works but I will put info on EBR when I get around to this.

Has anyone else tried to fix this "weak spot" issue with hub motor wheels?
ken that was one depressing but true post. makes me want to sell my magnum metro
 

Ken M

Well-Known Member
ken that was one depressing but true post. makes me want to sell my magnum metro
I honestly think this is something that can be solved but how many people have access to a wheel stand and a dishing tool to completely re-lace a wheel.

I'm working with PIM on a new model that will have magnesium wheels (26 x 3" rear and 27.5 x 2.4 front), single speed belt drive, Bafang M620 160mM motor with an A-to-B battery option for probably up to 2kwh, Carbon fork, integrated bars & stem and even a carbon suspension seat post. It's hopefully going to be a transportation-grade ebike that can go 1000s of miles with no service requirements and have unlocked speed assist to 36mph / 55kph range (not super fast by handy for some riding situations...otherwise it will be just a class 1/2 compliant ebike). Should have some preliminary information on EBR soon and even an organic discounted pre-production order plan with 100% assurance of delivery of product or down payment is 100% refunded by escrow bank service. Anyone that has spent time commuting on an ebike will like this model. There will be a future model with a rear hub motor but have to work out the magnesium wheel integration issues (no one produces a good integrated motor in the 26" or larger diameter per our testing).
 

Ken M

Well-Known Member
There is just too much defensive development in the ebike industry. It's like doing something like adding 500 grams of rubber to street tires so they last 10,000 miles on an ebike gets all the company bean counters to go bat guano nuts. Someone needs to create a disruptive ebike for super commuting and hopefully that is what this effort will lead to.
 

steve mercier

Well-Known Member
One of the issues with all rear hub motors (especially the larger diameter DD hub motors) is that the spokes tend to be bent at the tightening nipple. I was replacing spokes every 5000 miles on my hub motor ebike but I still loved the commuting performance of the motor. Usually one spoke would break followed by another a week or two later then another in a shorter time period (after 3 I would just replace all 3 but the next break would occur in less than 1000 miles and the cycle would repeat).

If the industry cared they could fix this very easily. For example the rim manufactures could improve the nipple seats such that they could tilt more for hub motor lacing.

I haven't had a chance to lace up a complete wheel with a rim that has been modified to verify that this indeed works but I will put info on EBR when I get around to this.

Has anyone else tried to fix this "weak spot" issue with hub motor wheels?
Grin Technologies has a post about a remedy for this problem on their site but it remains another of the main reasons I burned my hub-motored bridges.