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Strida evo3 gearbox disassembled

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Strida evo3 gearbox disassembled

Postby strida4ever on Tue Oct 02, 2018 6:23 am

Hi!

I own a strida evo 3. Thanks to Bill Willby I repaired the back hinge last year.

For quite some time my gearbox made scratching noises while pedaling. Not often - and changing through the gears made the scratching disapear. Now, last friday it began to squeak. That was the point, when I decided to disassemble the gearbox. To loosen the lockring at the belt wheel I had a friend mill a tool: drawing for the strida lock ring tool is available here.

I tried to be very careful when I opened the gearbox. Nevertheless it sprung open and I had a nice 3D-puzzle and a lot of bearing balls on my kithchen table... The balls have three different sizes, it is not hard to figure were to place which. When I reassembled the box I found 3 or 4 of the smallest size missing. The grease used in the gearbox is black, which is not its initial color. It might be just wear and may be some of the grinded down balls.

Does anyone know the exact sizes of the different bearing balls?

Thanks
Stephan

*Edit: Yes, I'll post pictures later, I need to clean out the grease first.
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Re: Strida evo3 gearbox disassembled

Postby Blackstridaaustria on Tue Oct 02, 2018 7:37 am

Hi Stephan,

welcome at Stridaforum :D

Guess it'll be tricky to get official info from Sturmey Archer; most likely they act like ATS and won't support repairs. Perhaps a stupid question, but wouldn't it be possible to measure the existing bearing balls?

Best regards,

Chris
STV@gmx.org
StridaTuningVienna

"Who knows nothing, must believe all." *

[* line from "Aphorismen"; Marie von Ebner-Eschenbach, Austrian poet, 1893]
[* book title; Werner Gruber, Austrian physicist, 2010]
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Re: Strida evo3 gearbox disassembled

Postby strida4ever on Tue Oct 02, 2018 8:04 am

Hi Chris,

thats no good news about Sturmey Archer :(

I can use my calliper gauge - at least I'm not sure about the precision of my efforts... I guess I'll just try and see what I can buy. If I have the new bearing balls on my table, I'll roll them together with the old ones between two sheets of glas to see if they differ in size. Should be precise enought. I think...

Stephan
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Re: Strida evo3 gearbox disassembled

Postby Blackstridaaustria on Tue Oct 02, 2018 8:18 am

strida4ever wrote:...thats no good news about Sturmey Archer :(


I'm not sure about that - just my meaning.
(However I've tried already to ask a contact in Taiwan, maybe they can reach Sturmey.)

I do know that the official repairs way is the same at ATS and Sturmey Archer; they want the defective drives back to refurbish them in house.

Good idea with the glass plate, also I think that there are not that many sizes available and there must be recognizable, certain steps between the sizes.
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Re: Strida evo3 gearbox disassembled

Postby Blackstridaaustria on Fri Oct 05, 2018 5:55 pm

Blackstridaaustria wrote:...ask a contact in Taiwan, maybe they can reach Sturmey...


Yes, they could talk to them and it is just as expected:
The KS3 drive is "exclusive" and therefore not any (technical) info available for the public!

I believe it could be also said like that:
"SA signed a contract with MC to manufacture the KS3 drives exclusively for them.
Part of the contract is also a big muzzle.
Period."

Bad alter ego:
"How dare you - you're a Westerner and want OUR technical data? No way!"
Very bad alter ego:
"That's fine vice-versa only, hihihihihihi"

Sigh...
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