fat tire

[gsbobber]

i have a 80 gs750 want a fatter tire in the bike what would need to be dont/modified in order to achieve that. looking for a 170 even better 180

[Hammered]

Alter a swingarm. Either replace the swingarm with one off a bike that can fit one OR alter the existing. Both are involved. Plus you will have to think about shimming the sprockets and/or maybe using a jack shaft. Im not sure how much wider youll need to go. Theres more involved but those are good starting points to consider.

[tkent02]

Why not get a new bike that isn't completely ridiculous with a wider tire?

[bwringer]

Aw jeeeeze...

[posplayr]

Aw jeeeeze...

I think U can get a 180 onto a 2.15" rim. I think U just gotta use some hair spray and a lighter

[Hammered]

I think U can get a 180 onto a 2.15" rim. I think U just gotta use some hair spray and a lighter

A 180 on a 2.15? Maybe but I wouldnt. Please say the Eek was for sarcasm.

[saffa]

buy yourself a bandit rear end ,machine some tophat spacers ,sleeve the pivot pin , weld on some lugs for the shocks and presto ...wider tyre . 170 fit just right without too much fecking about ...180 starts too get a little tight.


then you got the problem of a nice fat radial driving a skinny, soggy crossply tyre ... hmm ...doesnt sound to appealing

[posplayr]

A 180 on a 2.15? Maybe but I wouldnt. Please say the Eek was for sarcasm.

This is what I was thinkin; looks like a good way to go

http://www.youtube.com/watch?v=TzbgyRrQybQ

[TheCafeKid]

Aw jeeeeze...

BWAAHAHAHAHAHAHAHAHAHA

This will be Brians personal hell. He will be stuck in a room full of guys asking how to put on fat tires and how much shorter they can cut the shocks...

[Hammered]

If you have the resources, its an easy enough job to do. If youre not familar with welding, machining, jig building and a couple other things, hire someone to do it.

[posplayr]

If you have the resources, its an easy enough job to do. If youre not familar with welding, machining, jig building and a couple other things, hire someone to do it.

The journey is the reward

[Hammered]

The journey is the reward

In this case, Id say like someone else do the paddling. If this is done wrong, it could be deadly. Im just saying. Ive been a welder fabricator for 25 years and I wouldnt do my own dental work. Theres a set of skills involved that not everyone has. Sometimes its just better to come up with an idea and let those skilled do the work. Doesnt make it any less cool if its done right.

[tejasmud]

If this is done wrong, it could be deadly. Im just saying. Doesnt make it any less cool if its done right.

Yes, Sir.

In reality a big fat car tire can be made to fit, but will it handle 50 mph through twisties? Doubt it.

There is quiet a bit of engineering involved in bikes today. To be honest, and in opinion, vintage bikes can be modified to a point. I can see a 180, although, in most cases they will never perform in the same arena as bikes today. But as it is perceived, why even go there?

I would. Some of these older machines can actully be made to handle like a dream. Lots of $ involved, but why not buy a modern bike at that cost? Why bring a machine to pristene stock condition? It is a passion I believe.

Me, it would be worth the journey. May take a while, but the learning experience would be worth it. I would expect to spend some money though.

I would agree with, either have someone do it, or be prepared to do the calculations and fabrication. Build it, and believe it is, can, and will carve pavement might be a disappointment. A deadly one at that.

If one can understand it, I have a hard time doing so, but I would recommend the book, Motorcycle Dynamics, By Vittore Cossalter. It is certainly a mind twist.

Hope we didn't scare the OP off the board.

[RJ]

Gsbobber, do you have any clue as to why you believe you need to have a fatter tire on your bike? Is it just for looks? Not to insult you, but by the nature of your user name my guess is that you're an Orange County Chopper wannabe. While the guys that build those bikes have great fabrication skills, their final products are essentially garbage in terms of function. Putting a big fat rear tire on an old GS750 with no regard as to how this will change the functioning of the entire package that is your motorcycle is an invitation to trouble. These motorcycles, although old by modern Japanese standards, are light years ahead of any chopper/bobber. To go through the motions of trying to emulate those machines by turning a perfectly good motorcycle into a rigid-framed nightmare is insane. You would be better served to take the time to understand the dynamics of motorcycle suspensions before doing anything. Sorry about the negative vibe but it sounds like you don't have a good handle on what you are trying to accomplish.

[bwringer]

Yup, them old bikes don't handle worth a durn with them there skinny tires...