Shift fork size

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dellatorre6708
Posts: 19
Joined: Fri Oct 27, 2006 3:00 am

Shift fork size

Post by dellatorre6708 »

Does anyone know what the pad thickness on both ( selector side and cog side) ends of is supposed to be on a 4 speed shift fork?
Thanks. Frank.
NYC
Frank,
NYC

jimcarrr100rs
Posts: 25
Joined: Sun Oct 13, 2019 2:47 pm

Re: Shift fork size

Post by jimcarrr100rs »

Not sure what you mean but if you post a picture or something I can check mine as it is apart now.
77 & 83 R100RS, 56 R69

chrishea
Posts: 22
Joined: Tue Aug 04, 2020 12:54 pm

Re: Shift fork size

Post by chrishea »

I measured the one I had on hand. Slider side 5.81 mm and 5.83 mm, pretty close for a 55 year old part. Selector side 7.93 mm on what I will call the “major” diameter, this end has a definite curvature.
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Chris
Seattle

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malmac
Posts: 527
Joined: Sun Jun 29, 2014 2:10 am
Location: Toowoomba, Australia.

Re: Shift fork size

Post by malmac »

While I don't have my box apart just yet, this is a subject that interests me.

What I would like to know.

What is the clearance between the selector fork and the groove it runs in ideally meant to be?

Mal
mal - R69s
Toowoomba- Australia

chrishea
Posts: 22
Joined: Tue Aug 04, 2020 12:54 pm

Re: Shift fork size

Post by chrishea »

Mal, Great question. My guess is that the slider is about 6mm. I don’t have one to check. It’s really the “twist” of the fork in the slider that seems to matter. There is a transmission article in the Winter 2021 Issue (I know who wrote it ;) ). I suggest changing over to the eccentric shift fork bushings as found on the /5; lots of material on the web about that.
Chris
Seattle

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malmac
Posts: 527
Joined: Sun Jun 29, 2014 2:10 am
Location: Toowoomba, Australia.

Re: Shift fork size

Post by malmac »

chrishea wrote:
Tue Sep 21, 2021 10:07 am
Mal, Great question. My guess is that the slider is about 6mm. I don’t have one to check. It’s really the “twist” of the fork in the slider that seems to matter. There is a transmission article in the Winter 2021 Issue (I know who wrote it ;) ). I suggest changing over to the eccentric shift fork bushings as found on the /5; lots of material on the web about that.
Thank you for the response.

I will look the article up.

Cheers

mal
mal - R69s
Toowoomba- Australia

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