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Redesigning rear suspension for more travel

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Redesigning rear suspension for more travel

Old 09-13-06, 06:16 PM
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blown240
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Redesigning rear suspension for more travel

I am thinking of experementing with redesigning the rear suspension on my stumpjumper for more suspension travel. It looks like a longer upper link would give more travel if the shock stayed in the same place. I may even be able to design it so that it relaxes the geometry a bit.



Thoughts?

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Old 09-13-06, 06:31 PM
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That's funny
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Old 09-13-06, 06:37 PM
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You will most likely, 99.9% sure of it, screw it up and render the bike useless.
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Old 09-13-06, 06:41 PM
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Whatever happened to the guy that was modding his X-mart FS?

Anyone remember if he finished it?
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Old 09-13-06, 06:54 PM
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Originally Posted by Flak
Whatever happened to the guy that was modding his X-mart FS?

Anyone remember if he finished it?
I remember that...wasn't his name Tyson or something like that? Or am I way off? I'm really curious what happend there...it was an old Mongoose he was gonna "fix" right?

Anyhow...if you have another bike and don't mind if something happends to this one I say...go for it. Who knows maybe it'll work. Keep us posted!
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Old 09-13-06, 07:05 PM
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It seems to me like the rear wheel/components would be forced down if you were to make it any longer.
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Old 09-13-06, 07:11 PM
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WOA!!!! Here's a thought: Go buy a new bike instead of ruining that one.
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Old 09-13-06, 07:14 PM
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I think even if you figured how to redesign for more travel, you still need to buy a huge chunk of aluminum and machine it perfectly to less than 1mm. But I'm sure it's a fun project
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Old 09-13-06, 07:25 PM
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I think tinkering is a good idea if you can afford to lose this one if you kill it.

I guess people like Jason don't understand that playing around with stuff is fun for some people, even if the end result isn't good.
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Old 09-13-06, 08:04 PM
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How do you think modern bikes came to be Jason? Some guy had an idea tinkered around and it ended up working. If everyone was afraid to change anything on there bikes then nothing new would ever come out.
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Old 09-13-06, 08:05 PM
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Originally Posted by Flak
I guess people like Jason don't understand that playing around with stuff is fun for some people, even if the end result isn't good.
I understand that playing around with stuff is fun, I've made many 'inventions' of my own. But, knowing it's not going to work, and doing it, is just plain stupid.

Originally Posted by DylanTremblay
How do you think modern bikes came to be Jason? Some guy had an idea tinkered around and it ended up working. If everyone was afraid to change anything on there bikes then nothing new would ever come out.
Did you even look at the bike? The rear shock is about 2 inches long. Even IF he got it to work somehow, the most travel he could add to it would be so small, it would be pointless. Not only that, by changing the frame in such a way, you're risking frame failure.

There arn't too many of those bikes kicking around anymore. Keep it in good shape and you might get a lot of cash for it some day.

This is how you play with things:
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Old 09-13-06, 08:05 PM
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Make the linkage like 3 feet long then you'll have 36" of suspension travel.
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Old 09-13-06, 10:16 PM
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Originally Posted by DylanTremblay
How do you think modern bikes came to be Jason? Some guy had an idea tinkered around and it ended up working. If everyone was afraid to change anything on there bikes then nothing new would ever come out.
While I normally agree that experimenting works, in this case, that design has been rendered almost 100% obsolete. If he could also rework pivot locations then, potentially, he would have something. But that bike is really limited, purely by its original design.

Then again...it would still be fun if, and only if, you realize you might not end up with a usable bike in the end. Fun yes, difficult...oh ya...experience...give me a **** ya....again, if its a throw away, give it a go
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Old 09-13-06, 11:12 PM
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This is how I see it. Its not going to do any real damage to the bike. Its totally reversable. Ya it will probably suck to ride. But it would be cool to find out...

I dont know about "what mountain biking has become." I do know that I started out as a mechanic 13 years ago, that thats bikes have always been about having fun. To me this is fun.
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Old 09-13-06, 11:21 PM
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You're main limitation is going to be the one and only rear shock that you've got to work with. You can easily machine a longer lever but that will effectively weaken the shock's ability to absorb impact. Basically, you can increase the length of the lever and sooner than later, the shock will not even be able to hold your preload.
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Old 09-13-06, 11:32 PM
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Extend that linkage/shock pivot and get a new, longer shock. You could find an old used coil shock from a DH bike or something. It sounds like a fun project - keep us in the loop!
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Old 09-14-06, 12:18 AM
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Originally Posted by Jason222
WOA!!!! Here's a thought: Go buy a new bike instead of ruining that one.
Hey everyone check it out!! Jason is slamming another newbie!!

WHY are you still doing this? Do you not have a nice bone in your body? When you pick on a newbie like this, they don't want to come back let alone get a red star. Please be nice, Jason. He didn't ask for you to pick on him. He just wants to learn about improving it or changing it.
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Old 09-14-06, 12:32 AM
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Originally Posted by Jason222
WOA!!!! Here's a thought: Go buy a new bike instead of ruining that one.

Jason, tell me this. How long have you been on a mtn bike? How can you hate what mountain biking is becoming when you really don't have an idea about what it was or is. Here is a bit of a history lesson, the first mountain bikes were modified road and beach crusier bikes, so yes, modifying is in mountain bikings heritage. So with your bagging on blown's idea, is in reality spitting in the eye of where mountain biking has come from.

Pot Calling Kettle?

blown240, my suggestion is try it, what's the worse that can happen having it ride like crap, and like you said, it is reverseable if you find it not to your likings.
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Old 09-14-06, 06:12 AM
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I'd like to buy that bike from ya! That's history, man. I love it. Retro technology!!!

I first started reading this thread and it looked like nobody was really trying to help, let alone "J" being so rude.

I'm happy to see y'all defending yo fellow bikers. It makes the world an easier place to live in.

As far as the mod...I'd save the shock and link. Build a new link and buy a cheap old air shock that you could probably get on eBay for around $30 or less. This way you have infinate preload adjustability. A DH shock would be limiting unless it was a DHX air. Who know what spring rate you will need to change to.

Seriously though. That bike is valuable to me.
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Old 09-14-06, 08:36 AM
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I say as long as you're clear with the fact that you might end up with a non-functional frame which might need throwing out or have a frame failure I'd hit it, it'll probably a fun and interesting project.
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Old 09-14-06, 08:40 AM
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Thanks for the nice comments everybody! I think that I can do this for under $100 if I wait till the right shock shows up on ebay. I agree that the shock I have now wont cut it.

As far as selling this bike. I wouldnt want too. I got it from my dad who is now too old to ride. He bought it new and had it 10 years. Its got some sentimental value to me. Thats why I dont want to permanently change it. Besides its fun to go riding and see the reactions of others. Its like driving a classic car.
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Old 09-14-06, 08:42 AM
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Originally Posted by blown240
Thanks for the nice comments everybody! I think that I can do this for under $100 if I wait till the right shock shows up on ebay. I agree that the shock I have now wont cut it.

As far as selling this bike. I wouldnt want too. I got it from my dad who is now too old to ride. He bought it new and had it 10 years. Its got some sentimental value to me. Thats why I dont want to permanently change it. Besides its fun to go riding and see the reactions of others. Its like driving a classic car.
If you don't want to permanently change it I'd just be careful with it (don't ride it hard and just overall being careful). Apart from that have fun and keep us posted.
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Old 09-14-06, 09:33 AM
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...and don't forget the pics!!
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Old 09-14-06, 10:02 AM
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Looking at your bike… here are my thoughts.

Your bars are mounted to a very high stem indicating that your riding style is very upright and set for comfortable slow recreational riding.
Your saddle is not adjusted properly at all, indicating that you are riding with your weight shared between your arms legs and seat. This also is a strong indication that your riding style is slow and cautious.

If this is true, then there would be absolutely no utility gained at all by having more travel in your suspension.

Does your suspension bottom out? Do you need it to be more plush? Tell us why you think you need more travel and perhaps we can come up with a viable solution for your needs, because altering the set geometry of your linkage would be folly.
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Old 09-14-06, 10:07 AM
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Originally Posted by WorldWind
Looking at your bike… here are my thoughts.

Your bars are mounted to a very high stem indicating that your riding style is very upright and set for comfortable slow recreational riding.
Your saddle is not adjusted properly at all, indicating that you are riding with your weight shared between your arms legs and seat. This also is a strong indication that your riding style is slow and cautious.

If this is true, then there would be absolutely no utility gained at all by having more travel in your suspension.

Does your suspension bottom out? Do you need it to be more plush? Tell us why you think you need more travel and perhaps we can come up with a viable solution for your needs, because altering the set geometry of your linkage would be folly.
Originally Posted by blown240
I may even be able to design it so that it relaxes the geometry a bit.
I'd have to agree with WorldWind on this. I'm all for fiddling around and experimenting, but there are so many other, easier things you could do to this bike to make it better, or "relax the geometry a bit".

If it were my bike, I definitely wouldn't try to redesign anything for fear of permanently damaging the bike. It's a great bike, and it has sentimental value to you, so I'd just leave it as is. But that's just me...
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