Largest Tire size for stock GS750E wheel and swingarm??

[Big T]

We keep wasting bandwidth on this subject.
If you want Looks, over Handling and Safety, buy a cruiser.
A wider tire on the rear actually pushes harder on your front tire in a fast lean (think about the geometry, if you can ). You'll get a tank slapper.
Then you'll have to add a steering damper to help (not fix) the problem you created.
If anything, you should consider a narrower tire for rear.
Modern sport bikes are engineered for wide tires, a 83 GS 750 is not.
A narrower tire is actually cheaper.
Modern tires are pretty sticky.
Note: Its not that Harleys' aren't safe, you just don't push them in corners like a Sport Bike.

Fixerated that for you so we don't get no complaints here

Also, a bigger tire on a smaller rim puts less, lot more, rubber on the road.

[tkent02]

Fixerated that for you so we don't get no complaints here

Also, a bigger tire on a smaller rim puts less, lot more, rubber on the road.

But it looks phat, and he can't ride anyway.

[GateKeeper]

But it looks phat, and he can't ride anyway.

Exactly...so might as well make it look good.................

[GateKeeper]

so on a serious note....is the air valve stem a standard size, like the same as in a car rim, or is it a different size ? is it specific to a motorcycle, or can I grab a couple of new ones from my local garage (non motorcycle shop)

[mriddle]

My bike always rode best with the stock 120 on the stock rim. 130 felt just
okay and the one time I tried a 140 I hated it.

Was your 140 on the stock rim Billy ?

[GateKeeper]

I get what your saying......so one small question....why is it worthwhile then putting on a gixer front end and rear end and rims and phat tires on these bikes as a whole package

for looks only ? or does it make the bike better ?

I don't know, so I am seriously asking

but going one size up is not good

I will learn something new today for sure.....

.

We keep wasting bandwidth on this subject.
If you want Looks, over Handling and Safety, buy a Harley.
A wider tire on the rear actually pushes harder on your front tire in a fast lean (think about the geometry, if you can ). You'll get a tank slapper.
Then you'll have to add a steering damper to help (not fix) the problem you created.
If anything, you should consider a narrower tire for rear.
Modern sport bikes are engineered for wide tires, a 83 GS 750 is not.
A narrower tire is actually cheaper.
Modern tires are pretty sticky.
Note: Its not that Harleys' aren't safe, you just don't push them in corners like a Sport Bike.

[salty_monk]

Was your 140 on the stock rim Billy ?

My 750 had a 140/80 on a stock rim when I bought it. That is the profile my manual offered as an alternative.....

It was worn out so obviously been ridden that way. I didn't ride it more than a block myself..

The Brake Torque arm had been crushed to provide clearance & it had no chain guard on it so it obviously isn't a straight fit (at least on this one). I think it was a Mettzler but I can't be sure..

[tkent02]

If you are a talented enough rider to get to where the stock tires/wheels are not adequate, there would be some performance to be gained by beefing up the frame, going with a more rigid swing arm, bigger wheels and modern tires, suspension and brakes...

The bike will be a little better if you know what you are doing.

Will it be anywhere near a modern sport bike? No.

Bolting on a few parts here and there won't help much, except for better shocks and brakes. Fat tires on skinny wheels is detrimental.

[spyug]

Fat tires on skinny wheels is detrimental.

and may I add potentially very dangerous. The sidewalls can flex overmuch in certain attitudes and can pop off the rim or overheat and blow out or start shedding tread. Best to stick to the appropriate size for the rim.

Phat may be the look but lets keeping it on the ladies

Be safe folks.
Spyug

[tkent02]

Phat may be the look but lets keeping it on the ladies

Quote of the week....

[Wizard]

I guess you Can't imagine the geometry, let me try,,..
If you ride a High Performance bicycle, with 110psi skinny (less than 1" wide) tires, the energy/weight goes right down the middle of the frame, right down the middle of the of the tire, into the ground..
The rear wheel will ride exactly down the same track as the front wheel. Perfect.
Now imagine you are riding down Rodeo Drive, slipping first gear, with boom box blasting objectionable rap, on a bike that has a 24" wide rear tire and a 12" wide front tire (maybe that's not just imagining for some,,..).
If you go around a corner, the front tire will ride on the tire edge - 6 inches offset from center, and the rear tire will ride 12" off center.
Can you see the Geometry issues? What a mess. The rear tire point of contact is actually pushing the front tire sideways to some extent. The front tire already has issues scrubbing sideways to turn the bike, without the rear tire making it worse.
If you want Phunky looks, you own the wrong bike.
If you wanna experiment and build some abomination, get Ruphus over with a few cases of Shlitz and give'r with the wrenches. Just don't try to Sport Ride it, without first putting me in your Will.

[Big T]

Do you think the OP is still reading thsi thread, or you guys just chatting amongst yourselves?

[mrbill5491]

Hmmm, yes?

Do you think the OP is still reading thsi thread, or you guys just chatting amongst yourselves?

[Billy Ricks]

Was your 140 on the stock rim Billy ?

Yes. The sidewall was way too pinched leading to schitty handling and less contact patch when stood up.

[DannyMotor]

When its time for new rubber I'm getting a 120 rear. If you like riding spirited and enjoy turning safely... just mho.