180 vs 190 rear - Chicagoland Sportbikes
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post #1 of 19 (permalink) Old 07-24-2008, 10:09 AM Thread Starter
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180 vs 190 rear

I'm gonna switch to a 190 rear tire this weekend at BHF. should i slide the front forks down to compensate for the larger rear tire?



seriously though..

-Mopar

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post #2 of 19 (permalink) Old 07-24-2008, 10:18 AM
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dont forget to replace the blinker fluid and lube the muffler bearing, a 190 rear adds a lot more wear to those items

-Jason
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post #3 of 19 (permalink) Old 07-24-2008, 10:18 AM
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Couldn't find any 180 take offs for this weekend could ya?

Ian
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post #4 of 19 (permalink) Old 07-24-2008, 10:20 AM
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You have a power commander, you'll be fine




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post #5 of 19 (permalink) Old 07-24-2008, 10:20 AM
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Lower your rear to keep geometry the same. Or just run it w/o touching anything and see how you like it first, it should turn in a little faster but might be twitchier or cause head shake if the rear end was already pretty high.

Or instead you could just keep the 180 and not get on the gas so much... give the rest of us little folk a chance will ya?

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post #6 of 19 (permalink) Old 07-24-2008, 10:27 AM
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Just ride it. I don't notice much of a difference in ahndling... it's very subtle, and I switch back and forth from 180s to 190s.

Todd Murray
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post #7 of 19 (permalink) Old 07-24-2008, 10:35 AM Thread Starter
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Quote:
Originally Posted by JonGu View Post
Or instead you could just keep the 180 and not get on the gas so much... give the rest of us little folk a chance will ya?
screw that! how am i supposed to run 12s this weekend without getting in the power earlier???

-Mopar

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post #8 of 19 (permalink) Old 07-24-2008, 10:36 AM Thread Starter
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Quote:
Originally Posted by MM Racing View Post
Couldn't find any 180 take offs for this weekend could ya?
looking for more bite from the rear.. obviously at RA i didn't have enough

-Mopar

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post #9 of 19 (permalink) Old 07-24-2008, 10:41 AM
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or you could just be ham fisting it Cole

remember .... smoooooooooth, now go do 10 laps my way.




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post #10 of 19 (permalink) Old 07-24-2008, 10:45 AM
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Quote:
Originally Posted by MoparBoyy View Post
looking for more bite from the rear.. obviously at RA i didn't have enough
Get off the bike more and get it more upright. HAHAHA

Ian
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post #11 of 19 (permalink) Old 07-24-2008, 10:54 AM
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His way... {slaps a ruined tire}

my way... '{slaps a lightly worn tire} I was 6 seconds faster.




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post #12 of 19 (permalink) Old 07-24-2008, 12:48 PM
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If it fits right the only thing you may notice is it may push the front a little apex on out.

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post #13 of 19 (permalink) Old 07-24-2008, 01:17 PM
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Quote:
Originally Posted by MoparBoyy View Post
looking for more bite from the rear.. obviously at RA i didn't have enough
190/55 FTW!

Mike

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post #14 of 19 (permalink) Old 07-24-2008, 01:31 PM
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Quote:
Originally Posted by JonGu View Post
Lower your rear to keep geometry the same. Or just run it w/o touching anything and see how you like it first, it should turn in a little faster

Is that because the 190 will be effectively taller and more cone-shaped?


Quote:
Originally Posted by JonGu View Post
but might be twitchier or cause head shake if the rear end was already pretty high.
From the back end being higher with the 190 cause a steeper head angle?




*just trying to learn and verify my understanding

<--------Sticky Nicky
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post #15 of 19 (permalink) Old 07-24-2008, 01:31 PM
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they are my takeoffs bro, that is good for a couple seconds no changes needed.

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post #16 of 19 (permalink) Old 07-24-2008, 02:26 PM
 
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Quote:
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His way... {slaps a ruined tire}

my way... '{slaps a lightly worn tire} I was 6 seconds faster.


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post #17 of 19 (permalink) Old 07-24-2008, 02:44 PM
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Seriously though, try it. You should be fine at BHF.

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post #18 of 19 (permalink) Old 07-24-2008, 03:57 PM
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Quote:
Originally Posted by ronhix View Post
they are my takeoffs bro, that is good for a couple seconds no changes needed.
Ron's takeof's??? shit your gonna bust that thing in half.




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post #19 of 19 (permalink) Old 07-24-2008, 03:58 PM
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Depending on the track I would switch between the 180 & 190 with little to no change to the chassis geometry on my R6.

For some reason no matter what I did to the set-up, I just couldn't get the 190 to work at Blackhawk. Like Heath said it would not hold the line at the apex and wanted to run out a bit too much on the exit, consistently about 3-4 tenths of a second slower lap time with the 190 there.

That said, I do know some riders on other brands of bikes that ran 190's at BHF with success.

BHF is not one of my favorite tracks, it's more of a point and shoot track. There is not much opportunity to take advantage of the extra side grip the 190 offers during hard acceleration while still leaned over on corner exit.
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