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Discussion Starter · #1 ·
I've done a few searches, came up short.

I do mostly highway riding at the 75mph speed limit and while I have plenty of ooph at that speed, I'm also pushing 3200+ rpm and drinking more of the go juice than I'd like.

I was wondering if anybody has done any experimenting with tire sizes to see just how tall of a shoe we can cram back there to get a bit less rpm on those long high speed runs?

I'm doing my best to drive easy but I'm still under 200 miles on my tank with the fuel meter flashing at me.

So any suggestions? Much appreciated.
 

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No idea. I have run a couple of 200 wide tires with no issues but never considered going higher. I watch with interest.
 

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Shrubbo, I think he means higher profile tyre, not wider .... to increase the diameter of the wheel and thus reduce the revs slightly
 

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I found a chart giving the circumference for each tire size. I was looking for a bigger tire or a higher geared final drive. No joy. I remember finding the 200-55-17 would fit and one size bigger/taller. Any taller or wider rubbed. I ordered the Michelin Commander II 200-55-17

https://www.rockymountainatvmc.com/tires-and-wheels/michelin-commander-ii-rear-motorcycle-tire-p

I may have to put it on my CTX.
I noticed the left side was worn to the cords and the right was still good. Rear 8500 miles front 7500 oem.
 

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You have guessed correctly! I missed when it began flashing and subsequently how miles remained - once.

Enjoy!
Bill
LOL! I wished there was a light that came on at about half a gallon. I always reset my mileage anyway and do not worry too much about the bars.
 

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Discussion Starter · #10 ·
You do realize that the when the last bar starts flashing you still have about 1 gallon of gas left.
I do indeed realize that is the case. However I'm not too inclined to completely trust that just yet as sometimes my bike uses the go juice at a little faster rate than other times. Once I fully get used to the bike (I've only had it 2 weeks) I'll be more inclined to push it farther before I hit the gas station.

As far as my original question, it seems it hardly matters anyway. I'm not finding any tires that are any take than stick size available for sale anyway. It seems the selection is very limited with a 17in rear wheel.

I suppose I could swap in a 16in wheel from a goldwing to gain access to a larger tire selection, but now I'm dealing with spending more money, finding a spacer, mismatched wheels, etc. Hardley seems worth the trouble to save an mpg or 2.
 

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KurNorock, the odd tires sizes are a pain but at least it isn't like when they first came out. There is a thread somewhere here from 4 years or so ago with me going off about NO tires available for them. Ahh good times.
 

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KurNorock, the odd tires sizes are a pain but at least it isn't like when they first came out. There is a thread somewhere here from 4 years or so ago with me going off about NO tires available for them. Ahh good times.
Yep...the OEM tyres are even readily available now it seems....I just got a quote to replace mine with same.
 

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In the rear I wouldn't go more than one size taller. The front after looking at the fender I wouldn't try an off size. Which is bad since that is the odd sized tire that can be hard to find.
 

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I am not sure about the revs. However the wider rear will affect the top end. Cuts out about 10 mph at top speed. May not be a big deal for most. But for me it was. Went back down to the 180 rear.
 

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I am not sure about the revs. However the wider rear will affect the top end. Cuts out about 10 mph at top speed. May not be a big deal for most. But for me it was. Went back down to the 180 rear.
I've only owned mine since 12/2018 and finally had to try top speed. It was 126 mph.

I don't give a flip about pushing it to the limiter. I plan on getting a 200 on rear once this tire is shot.

Fast is fun but a 200 tire is funner. :laugh:
 

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Discussion Starter · #17 ·
I am not sure about the revs. However the wider rear will affect the top end. Cuts out about 10 mph at top speed. May not be a big deal for most. But for me it was. Went back down to the 180 rear.
That doesn't make any sense at all to me. A tire that is wider but the same diameter, such as a 200/50/17, shouldn't affect top speed at all. The Valk is limited to 126 but has the power to go much faster, so even if the slightly wider tire is heavier, it should still be the same limited top speed.

If the tire is wider but has the same ratio measurement, such as a 200/55/17, then it will also be a little taller. Increasing the diameter will make the bike have slightly slower acceleration (likely not noticeable) but a slightly higher top speed. The indicator will still read 126, but you will actually be going a small percentage faster, about 130.4mph with a 200/55/17 tire.
 

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I've done a few searches, came up short.

I do mostly highway riding at the 75mph speed limit and while I have plenty of ooph at that speed, I'm also pushing 3200+ rpm and drinking more of the go juice than I'd like.

I was wondering if anybody has done any experimenting with tire sizes to see just how tall of a shoe we can cram back there to get a bit less rpm on those long high speed runs?

I'm doing my best to drive easy but I'm still under 200 miles on my tank with the fuel meter flashing at me.

So any suggestions? Much appreciated.

Glad you brought this up. I was thinking the same thing. Metzeler has a 180 60 B17 listed. Im not sure what 5mm will gain on RPM if any. The 200 listed is a 55 same as stock.
 

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Discussion Starter · #20 ·
Glad you brought this up. I was thinking the same thing. Metzeler has a 180 60 B17 listed. Im not sure what 5mm will gain on RPM if any. The 200 listed is a 55 same as stock.
A 200/55 will be taller by nearly an inch than the 180/55 because metric tire sizes are silly. The second number is a ratio, not an absolute measurement. It means the tire sidewall height is 55% the tire width.

55% of 180mm is 99mm and 55% of 200mm is 110mm. That means the 200/55/17 will be 22mm taller than the 180/55/17. An inch is roughly 25mm.

A 180/60 will have a sidewall height of 108mm so it will be 18mm taller than stock which is still not bad, but not as tall as a 200/55/17.

My next tire is definitely going to be a 200.
 
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