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Message started by Dennisgb on 09/05/20 at 14:42:03

Title: Rear shock top bolt thread
Post by Dennisgb on 09/05/20 at 14:42:03

Trying to find the thread size and pitch for the rear shock upper bolt (stud).

Have looked all over. I need to make a clevis mount for my side car that will go on the shock mount

Title: Re: Rear shock top bolt thread
Post by verslagen1 on 09/05/20 at 15:08:18

If you screw those threads up, what are you going to do?

I would make a bracket that slipped over the shock mount on both sides and clamped in place with that nut.
A U shape and a U shape back to back.

Title: Re: Rear shock top bolt thread
Post by Dennisgb on 09/05/20 at 15:22:08

The clevis will be threaded and replace the stock nut. It will look like the nut with a clevis end. Sidecar mounting is done this way. The stock stud is high strength and takes the shock force so shouldn’t be a problem. Do you know what the thread is?

Title: Re: Rear shock top bolt thread
Post by zipidachimp on 09/05/20 at 19:48:48

the unthreaded portion is 14mm, from memory, the thread is M12.
Not a lot of room on that stud for a bracket, shock mount and nut!!!
Cheers! 8-)

Title: Re: Rear shock top bolt thread
Post by kamelryttarn on 09/05/20 at 22:19:26

I can double check later today but I'm pretty sure its a fine pitch M10 with a 1,25mm pitch.

Title: Re: Rear shock top bolt thread
Post by Dennisgb on 09/06/20 at 07:36:38

7F6D7D2F2E7E687D7C1A0 wrote:

I can double check later today but I'm pretty sure its a fine pitch M10 with a 1,25mm pitch.

That’s the conclusion I came to. I get messed up with metric. Is 1.5 course thread then? It looks to be fine thread

Title: Re: Rear shock top bolt thread
Post by kamelryttarn on 09/06/20 at 08:17:53

1,5mm pitch is standard for M10 I think. And there are both 1,25 and 1mm fine pitch variants but I measured mine a while back and ordered nyloc lock nuts for my bike.

Title: Re: Rear shock top bolt thread
Post by Dennisgb on 09/06/20 at 10:34:38

Thank you

Title: Re: Rear shock top bolt thread
Post by Dennisgb on 09/06/20 at 16:18:52

Picture of typical shock mount

Title: Re: Rear shock top bolt thread
Post by verslagen1 on 09/06/20 at 21:58:33

That maybe the way it's done, but as an engineer I can't help but wince.

Title: Re: Rear shock top bolt thread
Post by zevenenergie on 09/07/20 at 00:34:02

I also think that construction is risky, I would cut a piece of thick-walled pipe 2 "'long in half and weld it to the frame. And weld a fastener on it. Keep the hinge point as close to the frame as possible.

Title: Re: Rear shock top bolt thread
Post by Dennisgb on 09/07/20 at 05:17:04

Hmm, I’m an engineer also. 40+ years in the trade.

A couple of thoughts. First, there are four mounting points with the major support coming from a 2” diameter frame support point at the front just below the steering neck. Second the chair has suspension. It’s not a rigid load against the shock bolt. Also a consideration would be the strength of the shock mounting. It’s designed to take considerable force.

The chair needs to be mounted to these four points on non moving points on the frame which there aren’t many. I’m looking at whether a pivot clamp could be mounted to the frame next to the seat mount on the side. The space is very limited and it may interfere with rider(s).

I appreciate the comments and concerns but this is not an easy thing to accomplish and I have to rely to some extent on the experience of the chair manufacturers who have been doing this for years.

Title: Re: Rear shock top bolt thread
Post by Hiko on 09/07/20 at 21:45:43

I too have reservations about that mount yes the shock mount is sturdy but you are mounting to the 10mm shock retainer stud with a cantilevered load

I appreciate the options are limited but at the very least I would make that pivot point as short as possible not way out like is shown in the photo in an effort to reduce the leverage on that stud.

I think a better design fitting could be made there

Retired engineer