New Wheels

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I was warned of same when switching from the skinny stock sized tires to the 400x18 rear and 100/90/19 front on the Vin.
It does take a tiny bit more turn in effort, but if anything I'm cornering faster on the new setup.
You soon adjust to the new normal.
The other advantage to the 400/18 is its weight carrying capacity. The 100/90/19 has a 57 rating while the 400/18 has a 64 rating. If you are a large rider and you sometimes carry luggage plus a passenger, the 57 just isn't enough. The 100/90/19 looks overwhelmed with that load on because it is!
57= 507lb Load rating, 64=617lb load rating, 110 lbs greater.

Glen
 
The overall diameter of the tire being the same is only a portion of the equation. The four inch wide rear tire will numb the handling. Just so you're accepting of that performance downgrade, in advance.
JMWO
The width difference is 14mm so 7mm a side. The benefit will be moving from triangular profile tyres to round section so the slightly slower turn in will (should) be compensated for by better stability. I’ll report back when I have a definitive answer. If the handling is shot I’ll move back to a 19" rear, it’s not enough money for a wheel rebuild to lose the handling :)

Dave
 
Plenty have been running an Avon 4.10x19 Roadrunner classic style for many many years, which is a 4" tire. It's only whwn in conjunction with an 4.0x18 that folks get in a twist.

There is no performance degradation with going to a 4.0x18 rear.
 
Lower on the back and higher in the front increases the trail, so is probably better. It is when you fit 18 inch both front and back that the handling can become deader. The more squat you have on the rear end, the more the bike will turn in the correct direction, if you gas it through a corner.
 
Lower on the back and higher in the front increases the trail, so is probably better. It is when you fit 18 inch both front and back that the handling can become deader. The more squat you have on the rear end, the more the bike will turn in the correct direction, if you gas it through a corner.
The diameter of the Roadrider 100/90x19 and the 4x18 are both 671mm so there is no change whatsoever to the rake, trail or the overall stance of the bike.

Dave
 
The diameter of the Roadrider 100/90x19 and the 4x18 are both 671mm so there is no change whatsoever to the rake, trail or the overall stance of the bike.

Dave
Sounds good. I think PW was embarrassed when the kids started crashing the first Commandos, but the fix was probably a decrease in the trail by increasing the yoke offset. An adjustable hydraulic steering damper might have been better. With less trail the bike usually becomes less nimble. A lot probably depends on how you want to use your bike.
 
The overall diameter of the tire being the same is only a portion of the equation. The four inch wide rear tire will numb the handling. Just so you're accepting of that performance downgrade, in advance.
JMWO
Not so. I have 100/90 x 19 Avon Roadriders at both ends on 3.5 inch rims. The steering is very quick, at least as quick as a 750 with its' skinny earlier tyre yet is precise and stable at any speed. Where on earth did you get the idea that the "handling would be numb"?
 

There are some pretty wide ranges on some tyres. But I can see that there is a best size for each.

Thats a very general guideline, probably not worth much TBH.

Its dependant on the tyre design, so the tyre manufactures are the best source. Avon make it very easy on their site with a specific recommended rim width and an allowable min / max...

 
I recently bought a pair of Avon AM9, 4.10 x 19. They seem to be perfectly suitable. I still have the original WM2 x 19 Dunlop rims on my wheels. I did try a 3.50 (narrower) front tyre once, but I found it was a bit too 'light' steering for my liking.
 
Full auto wrote " Probably like wide rims on a hardly dangerous"

Or as on a new MV Augusta, Triumph Thruxton R or Yamaha R1?
All use wider rims than our Nortons and all will run around any racetrack or mountain twisty a lot faster than our old Nortons.

Glen
 
Full auto wrote " Probably like wide rims on a hardly dangerous"

Or as on a new MV Augusta, Triumph Thruxton R or Yamaha R1?
All use wider rims than our Nortons and all will run around any racetrack or mountain twisty a lot faster than our old Nortons.

Glen
That's pretty smart (arse) for somebody who can't even spell "Agusta".
 
I recently bought a pair of Avon AM9, 4.10 x 19. They seem to be perfectly suitable. I still have the original WM2 x 19 Dunlop rims on my wheels. I did try a 3.50 (narrower) front tyre once, but I found it was a bit too 'light' steering for my liking.

I wasn’t impressed with Roadrunners back in the 80s. Changing to Metzlers transformed the handling, I remember thinking it felt like the bikes were glued to the road in comparison.

But that was then, and the new ones are a different compound etc, so I’d imagine them to be very good.
 
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