the biggest size of tire that fits on a 17 inch wheel

[sayhello]

new to the forums -

i run a Suzuzki VX 800 - and i love this bike.

the VX 800 has got a cardan. With that you cannot change easily the transmission.

i want to change the transmission and the final drive ratio - over all gears.


stock tire: 150/70-17

one possible would be 140/90-17

Difference; 6,1 % bigger final drive ratio:


rolling circumference: stock ( 150/70-17 ) : 17 X 2,54 + (2x 105mm) X 3,14, = 2015 mm
rolling circumference: tuning ( 140/90-17 ): 17 X 2,54 + (2x 126 mm) X 3,14,= ca. 2147 mm

Difference; 6,1 % bigger final drive ratio:


question: which tire is the __biggest__ that i can run on a 17 inch wheel?


love to hear from you
say

[stinkwheel]

Two things.

1) Why? I presume you're trying to make it faster? Does it even max out the revs in top gear anyway? In which case what do you hope to achive by increasing the final drive ratio?

2) You will screw up the handling something shocking by fitting a tyre with such a tall profile.
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[iooi]

[stevo as b4]

Agree with stinkwheel on this.

Unless your bike is revving out past peak power and hitting the redline easily in top gear then higher gearing is not going to make you go any quicker. And if it's for lower Revs fast cruising you need more power from the engine than standard at those lower rpms to maintain the speed. There's limited ways to get significantly more low-midrange power from an engine without more capacity or considerably more cylinder filling.

If your bike is more powerful and the gearing is too low then assuming there's no easy options to increase either the shaft final drive ratio or the primary drive ratio, then I'd look at an 18'' rear wheel and maintain the current tyre profile to keep the handling more normal, that's if there's clearance for a bigger wheel and tyre?

[Robby]

I used to have one of them. I assume you want to get it revving lower at motorway cruising speeds, it is a bit buzzy.

There isn't much you can do. Messing around with tyre sizes will ruin the handling - and it's only just good enough to be safe as it is. Final drive is shaft so you can't fiddle with that.

Not sure how the primary drive works. If it's a chain primary, you might be able to change its sprockets. Normal sort of thing to do on Harleys, very rare on Japanese bikes, even those that do have a chain driven primary. Wouldn't be worth the effort.

In general, just ride it and accept what it is. Even if you could fiddle with the gearing, the transmission lash on mine was quite nasty below 2500rpm.

[sayhello]

hello dear all - many thanks for the reply!!!!

at this moment i am a bit short of time. But - i am very very happy to hear from you.

what do i want to achieve: i want to lower the rpms - with a new gearing /( a new final ratio) over all gears.



i will come back later the day again. i can write more explanations!!

untill later the day...

see you

[stinkwheel]

[sayhello]

hello guys



what i need to know - is there any !! tire that fits on the rear wheel of the Suzuki VX 800


the data : 150/70 runnig on a wheel with width 3,5 " and 17" size .

[sayhello]

j run vx 800 - I absolutely love everything about this bike except one thing, the highway cruising RPM's. I commute 50 miles a day and love using the bike for the fun factor and fuel mileage. Most of my commute is between 60-75MPH, which is in the 4000-4700 RPM range.I have been considering different methods to lower cruising RPM's, specifically a taller rear tire/rim or different rear drive gears.


with the above mentioned tire the
tuning:
rolling circumference: tuning ( 140/90-17 ): 17 X 2,54 + (2x 126 mm) X 3,14,= ca. 2147 mm


... i only have 6 % better - or in other words taller gearing-transmission-ratio throughout all the gears.

what should i do if i want to have more!?

are there any tires that do the job on a 17 " x 3.5 " wide rim?!

[Alex A]

Have you read anything in this thread?

Fitting an extremely high profile tyre will ruin handling, probably to the point of it being dangerously unstable.

4500RPM is not much. Live with it. Or sell it and buy a bike with taller gearing / more torque.

[nitrosurf]

Considering the output of one of those that's actually not a bad amount of revs for that speed. It's not a diesel Mondeo, you won't get 2000rpm at 70mph dude.

Have you got some orimental exhausts on it? Maybe that's exacerbating things...?

🏍
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[stevo as b4]

I'd be adding at least 30bhp to the motor before thinking about taller gearing.

If you can reduce the cruising rpm significantly, then what is your plan to at least maintain std levels of performance and acceleration? Are you adding nitrous oxide for example?