SuzukiSavage.com - Rear shock top bolt thread

Dennisgb Full Member Offline SuzukiSavage.com Rocks! Posts: 176 Maplewood MN Gender:	Rear shock top bolt thread 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
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verslagen1 YaBB Moderator ModSquad Offline Where there's a will, I want to be in it. Posts: 28844 L.A. California Gender:	Re: Rear shock top bolt thread Reply #1 - 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.
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Dennisgb Full Member Offline SuzukiSavage.com Rocks! Posts: 176 Maplewood MN Gender:	Re: Rear shock top bolt thread Reply #2 - 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?
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zipidachimp Serious Thumper Offline SuzukiSavage.com Rocks! Posts: 1406 surrey, b.c. Gender:	Re: Rear shock top bolt thread Reply #3 - 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!
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RocketScienceSmurf Senior Member Offline SuzukiSavage.com Rocks! Posts: 268 Sweden Gender:	Re: Rear shock top bolt thread Reply #4 - 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.
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Dennisgb Full Member Offline SuzukiSavage.com Rocks! Posts: 176 Maplewood MN Gender:	Re: Rear shock top bolt thread Reply #5 - 09/06/20 at 07:36:38 RocketScienceSmurf wrote 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. 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
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RocketScienceSmurf Senior Member Offline SuzukiSavage.com Rocks! Posts: 268 Sweden Gender:	Re: Rear shock top bolt thread Reply #6 - 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.
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Dennisgb Full Member Offline SuzukiSavage.com Rocks! Posts: 176 Maplewood MN Gender:	Re: Rear shock top bolt thread Reply #7 - 09/06/20 at 10:34:38 Thank you
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Dennisgb Full Member Offline SuzukiSavage.com Rocks! Posts: 176 Maplewood MN Gender:	Re: Rear shock top bolt thread Reply #8 - 09/06/20 at 16:18:52 Picture of typical shock mount
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verslagen1 YaBB Moderator ModSquad Offline Where there's a will, I want to be in it. Posts: 28844 L.A. California Gender:	Re: Rear shock top bolt thread Reply #9 - 09/06/20 at 21:58:33 That maybe the way it's done, but as an engineer I can't help but wince.
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zevenenergie Serious Thumper Offline SuzukiSavage.com Rocks! Posts: 1296 The Netherlands Den Haag	Re: Rear shock top bolt thread Reply #10 - 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.
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Dennisgb

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Re: Rear shock top bolt thread
Reply #11 - 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.

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Hiko

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Re: Rear shock top bolt thread
Reply #12 - 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

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