Hidden Subframe

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Hidden Subframe

Post  Jason Woodall on Tue May 26, 2015 10:04 am

Hi Gang,

I know these aren't to everyone's liking, but does anyone know how to do a hidden subframe for a stripped down back end, like this please?

http://jd3trucks.com/000_4177.jpg
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Re: Hidden Subframe

Post  SkidMark on Tue May 26, 2015 4:40 pm

I have nothing good to say about that so I wont say anything at all.... razz
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Re: Hidden Subframe

Post  SkidMark on Tue May 26, 2015 9:29 pm

oh ok I will then..... not sure whether the exhaust is supporting the seat and fender or the seat and fender is supporting the exhaust..... scratch

I can only guess that the guy sits all the way forward all the time in the 'attack' position.
To support a persons weight on the back of the seat you need a triangular structure or a very chunky piece of straight tubing that there doesn't appear to be space for under the seat.... Your best posting on a supermoto site for better info. Most folks on here are of the mindset that piggys like rolling in the mud.

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Re: Hidden Subframe

Post  Jason Woodall on Wed May 27, 2015 8:57 am

Thanks for the reply Skidmark,

Let's not get off on the wrong foot everyone, I like the muddy setup and the touring set up as well as the supermoto setup. I was intending on having both set ups myself. I live in the countryside, loads of single track and mud, but I like the road set up as well... It's cool to like more than 1 style right? Cool There will be times when I want to do a 100 mile skip to see my family, so road wheels are just safer and more practical...

Back to the hidden subframe. From the back it appears to have several small gauge tubes under the seat, and he has left the back foot pegs on, so I reckon the subframe is there. On a stripped down backend, why would you leave the pegs on if you're not going to use them?


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Re: Hidden Subframe

Post  Jason Woodall on Wed May 27, 2015 10:04 am

You can see from this pic that the seat has been bolted from the top, at the back...
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Re: Hidden Subframe

Post  Mauser on Wed May 27, 2015 10:06 am

The main frame could take a large steel plate running towards the back of the seat, with the right profile on the plate it could easily be strengthened up to hold a person...you try bending 5mm plate over 300mm.....you won't lol.....you would need something to keep the crap from covering the underside of the seat so a plate maybe the answer ?....

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Re: Hidden Subframe

Post  Jason Woodall on Wed May 27, 2015 10:21 am

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Re: Hidden Subframe

Post  Mauser on Wed May 27, 2015 10:33 am

Send him an email and ask for a few snaps showing the underside ?

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Re: Hidden Subframe

Post  Jason Woodall on Wed May 27, 2015 2:14 pm

I sent him a message this morning, but I don't hold my hopes up for a reply. The guy's projects start at 75K so I'm not sure he'll be interested in helping me out for free...

I even asked for a bolt on price =D
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Re: Hidden Subframe

Post  SkidMark on Thu May 28, 2015 8:49 pm

Jason Woodall wrote:Thanks for the reply Skidmark,

Let's not get off on the wrong foot everyone, I like the muddy setup and the touring set up as well as the supermoto setup. I was intending on having both set ups myself. I live in the countryside, loads of single track and mud, but I like the road set up as well... It's cool to like more than 1 style right? Cool There will be times when I want to do a 100 mile skip to see my family, so road wheels are just safer and more practical...

Back to the hidden subframe. From the back it appears to have several small gauge tubes under the seat, and he has left the back foot pegs on, so I reckon the subframe is there. On a stripped down backend, why would you leave the pegs on if you're not going to use them?


Hey I was mostly just messin with ya!...although my underlying point was that most on here are riding offroad or adventure riding so you would probably get better advice on a dedicated supermoto site.

That said it is hard to judge the strength of those tiny tubes he has used without knowing the material and so the strength of it. But whatever material it is I don't think it would hold up with a guy sitting back on the seat let alone a rider and passenger! And then you add a possible hard landing when riding offroad combined with the long arm there and you could have a lot of force at the back of the seat. I would think you need an extra brace to form a triangle if you were having a passenger on the back or riding off-road.

Still, will be interesting to hear from the guy if he gets back to you.

Cheers,

SkidMark
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Re: Hidden Subframe

Post  Jason Woodall on Fri May 29, 2015 9:34 am

Yeah that's all fair comment I reckon Skidmark. I know I'm coming across as a square peg in a round hole a bit... I'll try to stick to more dirty talk in future...

The guy did get back to me, but wasn't forthcoming with anything useful...
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