My old 1987 Suzuki Quadzilla is a fast machine, and now that my nephew owns it and races me against my V force and whoops me top end; i was thinking... Why couldn't I but a set of mutLites, or Dirt Devils.. or some other tires with a larger size and increase my top end the same way i used to change sprockets on the Quadzilla?

I figured... C=2 PI r ; so 22-11-10 equals 69 inches Circumference = Top speed of 63 mph.
what if? 24-11-10 equals 75.4 inches C = 68.8 mph top speed
or 25-11-10 equals 78.5 inches C = 71.7 mph top speed.

Granted, i'm not sure they would fit with the foot pegs and i realize that low end would suffer quite a bit, but for all out running wide open; i think it would help alot...

What do you V force owners think?

 

along with the tires you would probably want more stall on your primary spring (to allow more rpm inturn allow the rears to spin)so with the taller tires it would launch better instead of bogging down.(slow take off, no spin (tires)

 

22 inch tire and only 63 mph ???

 

another point you won't get the mph with the shorter tire. there is such a thing as having to much gear ( to short of tires) and not enough gear with to tall of tires.

 

Yeah,

I was reading an ATV magazine which had a shootout between the V force, Raptor, Predator, and DS650. And it said the V force is the fastest from 0-30mph; but it's top speed was 63mph stock. The stock rear tire on a V is 22-11-10 holeshots. So that's how 63mph = 22 inch tire came about.

With all the V's torque, i don't see it as being a problem by raising the circumference of the rear tire, making it essentially faster at top end. I'm guess I'm missing SCHL48's point. If you read my original post, it is making the point that smaller rear tire = slower top end = more torque @ low end.. the larger the rear tire = faster top speed = lower torque @ low end.. --> I understand you could go too far and lose the usuable torque from the V at low end; but that's yet to be seen.

I believe in theory, my idea will work fine. It will have to be a balance between bigger tire for more top end and drivability with lower low end torque... But I think it may be worth a hundred bucks to buy a set of tires and try it out.

If/when i do it, i'll try to post results..

 

I read the same article today too but don't believe it the Vforce runs 70-75 I don't know where they got their numbers from that Stalker radar is susposta be very accurate but those numbers just are not correct.


Kevin

 

It will have to be a balance between bigger tire for more top end and drivability with lower low end torque... But I think it may be worth a hundred bucks to buy a set of tires and try it out

i agree with you with the balance....

i ran about 70 with 19 in tires in 300 ft race, time and mph with lights at race track and 20 in tires ran 74 in same distance.
when bike was stock i ran 70 mph in 300 ft but had power left.

 

The article i had said the DS650 was the one that ran up to like 72 mph. The predator was like 69 and the raptor was like 67 and the V force was 63. I'm positive it only had a 0-70mph time for the DS650 because it's the only one that can get there.

Maybe in the next year when there are some used V-force rear rims available, i'll get a set and get some 24-11-10 tires to try my theory.

I can race against my brothers cannondale speed, nephews Quadzilla 500, or my other brothers 250 Quadracer... they should give me a good read on any improvements.. i still love the look in everyone's eyes when we drag race and i jump to a quick lead looking back... and that's on my 520 pound machine with me weight 325# being 6'4". lol

 

To a point, you will have more top speed... some things you didn't mention,

A taller tire is generally going to be heavier... more rotaional mass requires more power... as the V Force, like the Prairie, retards the timing to reduce top speed, there will need to be a balance there between overall gear ratio, rpm, & increased rotaional mass...

The tires you mentioned may also have a greater rolling resistance than the stock tires... while this may be marginal, it will effect it alot more, at the higher rpms, when the timing is retarding...

A taller tire is going to raise the quad, increasing the air resistance... the suspension could be strapped to lower it, to easily over come this effect though...

 

Good point about the tire weight, i didn't check what the stock XCT's were, and they are 16# while the mudlites that i was thinking of going with in 24" weight 21#. So actually quite a bit more weight. I did find a set of Duro HF274's in 24-11-10 that only weight 18#. So much closer.. but probably a little more rolling resistance..

I didn't know that the timing was actually retarded to the point that it adversely effects top end. I hear rumors about this CDI box for the V force; is that why there's interest in it? to help offset the timing problem restricting top end on a V force...

The problem about having the rear of the quad sitting up in the air, really isn't a problem for me. At my weight of 325#, the rear squats quite a bit. It will probably sit alot more like it does with the 180 guy on it normally.