Tire Diameter

[landshark]

Dunlop GPA 120/55 dia. 600mm
Dunlop GPA 190/55 dia. 640mm

Bridgestone 003 front 120/70 600mm
Bridgestone 003 rear 180/55 640mm
Bridgestone 003 rear 190/55 650mm

Pirelli Diablo front 120/70 600mm
Pirelli Diablo rear 180/55 dia. 641mm
Pirelli Diablo rear 190/55 dia. 652mm
Pirelli Dragon front 120/70 dia. 600mm
Pirelli Dragon rear 180/55 dia. 643mm

Michelin front A-B 120/70 dia.605.4mm
Michelin rear all 180/55 dia 639.5mm
Michelin rear all 190/55 dia 652.8mm


All measurements have been double checked against the available on line data.

[SPL170db]

Mounted and inflated?

[landshark]

Nope all unmounted.

[ronaldo9]

Interesting Troy I guess I'll lose some ride height switching to the dunlops or the bstones since I use the dragons primarily.

[lateapex]

10mm is just a hair over 3/8 of inch.

Unless you used to be able to hang with Rossi and you swapped tires and now you can't hang with him, I wouldn't change anything.

[breeze]

dude....????? just ride the damn bike......

[landshark]

10mm is substantial. Try moving your forks just 1/2 that. On the rear 10mm = 3 full turns of shock length.

[lateapex]

Here's my experience and why I say it doesn't matter.

For years I rode my first 99 R6 with forks setup for a 150lbs rider and stock rear shock, I'm not nearly that light but I rode the wheels off it, it felt planted and I could lean the thing until the fairing scraped.

Then I bought another 99 R6 with forks set up for my weight and Penske rear setup for my weight too and I was no where near as comfortable on it as the first one and fought it for many track days to get it better but never like the first R6 I had.

Now I have a 04 R1 with stock suspension and got it dial in now and if I get my head out of my butt and ride it I'll be just fine and be scraping bodywork again.

It's a mental game, so it you feel 10 mm is going to effect the bike then by all means make the changes. After all you gotta be 110% comfortable on it, not me.

[ffejtable]

Also, a 10mm change in diameter is only a 5mm change in ride height... and these were unmounted, so does sidewall stiffness also play a role in actual ride height?

[RCM78]

Originally Posted by landshark

10mm is substantial. Try moving your forks just 1/2 that. On the rear 10mm = 3 full turns of shock length.

This measurement does not transfer to ride height on a 1 to 1 scale. SportRider had a calculation you could use but they used the circumference of the tire and not the diameter.

[landshark]

Ha ha whatever you choose to do with that info is on you.

[SPL170db]

Originally Posted by RCM78

This measurement does not transfer to ride height on a 1 to 1 scale. SportRider had a calculation you could use but they used the circumference of the tire and not the diameter.

That's what I was thinking.

Mounted and inflated measurements might change depending on the exact construction of the tire's carcass. Not to mention how they hold up at speed, like those lovely old D209's that used to expand once you got over 120mph, teetering everything forward and causing ugly headshake.

[landshark]

Yes there was a noticeable difference going from the Dunlop to the Bridgestone. I raised the front 3mm.