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gsbobber
Guest
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
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Hammered
Guest
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.
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
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Hammered
Guest
A 180 on a 2.15? Maybe but I wouldnt. Please say the Eek was for sarcasm.I think U can get a 180 onto a 2.15" rim. I think U just gotta use some hair spray and a lighter
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saffa
Guest
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:dancing:
then you got the problem of a nice fat radial driving a skinny, soggy crossply tyre ... hmm ...doesnt sound to appealing:dancing:
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TheCafeKid
Guest
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...
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Hammered
Guest
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.
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Hammered
Guest
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.The journey is the reward
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tejasmud
Guest
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.
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RJ
Guest
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.
I don't think there is anything wrong with wanting larger or especially more modern rubber/brakes. The issue is that there are allot of posts around here that suggest it is a bolt on mod which it is but it is the things that go with the bolt ons that add the complications. Guage Mounts, Bar Mounts, swing arm swaps and the like.
There are obviously easier conversions that others. Most have the problem to change the tires you need to change wheel which means you change rotors and have to change forks which means triples and now you have to mount bars,steering stops and guage mounts to match.
Those that are experts at this having been professional or amateur fabricators for many years have forgotten the "Oh yea, I should have mentioned" or "of course you gotta's".
I've been documenting a 1st Gen gixxer conversion with Bandit swinger and 18" 3 spoke wheels for my ED if you wanna see part of what is involved from a newbie going through the process.
There are obviously easier conversions that others. Most have the problem to change the tires you need to change wheel which means you change rotors and have to change forks which means triples and now you have to mount bars,steering stops and guage mounts to match.
Those that are experts at this having been professional or amateur fabricators for many years have forgotten the "Oh yea, I should have mentioned" or "of course you gotta's".
I've been documenting a 1st Gen gixxer conversion with Bandit swinger and 18" 3 spoke wheels for my ED if you wanna see part of what is involved from a newbie going through the process.
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Sunburn
Guest
I can still scare the chit out of myself with a my "130" rear tire.
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TheCafeKid
Guest
I don't think there is anything wrong with wanting larger or especially more modern rubber/brakes. The issue is that there are allot of posts around here that suggest it is a bolt on mod which it is but it is the things that go with the bolt ons that add the complications. Guage Mounts, Bar Mounts, swing arm swaps and the like.
There are obviously easier conversions that others. Most have the problem to change the tires you need to change wheel which means you change rotors and have to change forks which means triples and now you have to mount bars,steering stops and guage mounts to match.
Those that are experts at this having been professional or amateur fabricators for many years have forgotten the "Oh yea, I should have mentioned" or "of course you gotta's".
I've been documenting a 1st Gen gixxer conversion with Bandit swinger and 18" 3 spoke wheels for my ED if you wanna see part of what is involved from a newbie going through the process.
Agreed. IF i change over my ES to the 86 Gixxer stuff, my main goal is only to get the better brakes and more and modern rubber on the ground. However, I think the large misconception for people looking to do these mods is that it will somehow make the old GS handle like a modern sportbike. What doesnt seem to be understood to the full by the guys just poking around about it (like myself at first) is that the single most limiting factor at that point becomes the frame, followed closely by the weight of the bike to begin with. It will NEVER handle like a GSXR or R1 or the like, even if you go thru with bracing the frame, but it will help to do so. However, the cost factor in this endeavor becomes the NEXT limiting factor for alot of us. When you consider that to do all the necessary modification to make the bike actually HANDLE better other than just having better stopping power and stickier rubber, it simply doesnt make sense. The price tag, all said and done, can end up well over 3 grand, and for that, you can land a NICE Bandit, or a few years old FZ1 or ZRX...
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gsbobber
Guest
well rj im not an oc chopper wanna be but i am a newb to this im accually trying to build a cafe reson why i want the fat tire is one the look and two the handling i want to be able to take it up to the canyons and be able to handle i just have a hard time trusting the skinny tires the real is currently a 110 and the front a 100 but like i said im a newb. my apologies
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TheCafeKid
Guest
You can fit a 120 or a 130 on the back of that 750 bro and be good to go. a 130 will pinch JUST a little but not much. If you hunt up an 82 1100 rear wheel you can go with the 130 with no pinch, and its also a 17" rim... Same wheel pattern so it will look the same, and its pretty much bolt on and go, might have to adjust the spacers a hair. Dont be afraid of the skiny tires...it will lean over way farther than YOU will before it gives up the ghost...Just gotta teach your mind to trust the rubber...btw, get GOOD tires on that thing...Avon Roadriders or Pirelli Sport Demons or the like...Good tires, even on a skinny wheel, are amazingly confidence inspiring.. No one here is trying to pick on you or anything, its just a lot of guys get on here and think they can turn these old bikes into new bikes....just cant do it man. Good Luck! We're here to help!
