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Old 05-13-2011, 11:42 AM   #1
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Tire sizes...

GSXR 1000 here. Stock wheel takes a 190 tire. Would it be unsafe to place 180 race takeoffs on there? What are the issues or pros/cons if there are any.
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Old 05-13-2011, 11:59 AM   #2
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Quote:
Originally Posted by NitroHonda View Post
GSXR 1000 here. Stock wheel takes a 190 tire. Would it be unsafe to place 180 race takeoffs on there? What are the issues or pros/cons if there are any.
The 180 would have to be stretched to fit the wider wheel.

A 180 mounts to a 5.5" wheel
a 190 mounts to a 6" wheel

Just get a 190/55 tire.

Years ago, some guys would do that to get the taller profile of the 180/55 for quicker turn in, but since the 190/55 came out, no need to do that anymore.

I wouldn't put a 180 on mine, but the choice is yours.
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Old 05-13-2011, 02:22 PM   #3
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Quote:
Originally Posted by Godsuki View Post
The 180 would have to be stretched to fit the wider wheel.

A 180 mounts to a 5.5" wheel
a 190 mounts to a 6" wheel

Just get a 190/55 tire.

Years ago, some guys would do that to get the taller profile of the 180/55 for quicker turn in, but since the 190/55 came out, no need to do that anymore.

I wouldn't put a 180 on mine, but the choice is yours.
A 180/55 would have a shorter actual height and sidewall, not taller.

You could get a 180/60 on there, but why bother?
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Old 05-13-2011, 02:48 PM   #4
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Quote:
Originally Posted by honorsdaddy View Post
A 180/55 would have a shorter actual height and sidewall, not taller.

You could get a 180/60 on there, but why bother?
Reason I ask is because there's a sweet deal going down on a batch of very clean 180 Supercorsa takeoffs. No 190s currently available. $$ is my sole reasoning in behind me considering this option. I'm not necessarily priced out from the 190s either. Just looking for options to stretch my dollar a little further. After spending easily over $1,500 on my trackday experience recently, I need to trim the fat quite a bit or I'm going to be priced out of this rather quick. I have access to a tire changer and a very good mechanic so I'd like to better understand the ramifications of available tire size options while I have that opportunity available for my trackday experiences this year.
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Old 05-13-2011, 03:13 PM   #5
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Quote:
Originally Posted by NitroHonda View Post
Reason I ask is because there's a sweet deal going down on a batch of very clean 180 Supercorsa takeoffs. No 190s currently available. $$ is my sole reasoning in behind me considering this option. I'm not necessarily priced out from the 190s either. Just looking for options to stretch my dollar a little further. After spending easily over $1,500 on my trackday experience recently, I need to trim the fat quite a bit or I'm going to be priced out of this rather quick. I have access to a tire changer and a very good mechanic so I'd like to better understand the ramifications of available tire size options while I have that opportunity available for my trackday experiences this year.
Well that makes perfect sense.

You'd be looking at a shorter tire which you'd have to run at higher air pressures. Your gearing would change as well since the OD of the wheel/tire combination would be different. Overall height of the tire would be ~1-3/4" shorter. Your section width (tread width basically) would be 10mm less so you'd be looking at reduced traction. Less sidewall deflection combined with higher air pressures would lead to a firmer ride. None of these changes are a benefit really - but you have to weigh these losses against the $$ gains.

As far as wheel width, that's where your issue comes in. Pirelli only recommends a rim width of 3.5-3.75" for that 180/55 - so in that regard, you're seriously exceeding the recommended mounting width using a 180mm tire.

Your call but I wouldn't do it.
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Last edited by honorsdaddy; 05-13-2011 at 03:18 PM.
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Old 05-13-2011, 03:24 PM   #6
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Quote:
Originally Posted by honorsdaddy View Post
Well that makes perfect sense.

You'd be looking at a shorter tire which you'd have to run at higher air pressures. Your gearing would change as well since the OD of the wheel/tire combination would be different. Overall height of the tire would be ~1-3/4" shorter. Your section width (tread width basically) would be 10mm less so you'd be looking at reduced traction. Less sidewall deflection combined with higher air pressures would lead to a firmer ride. None of these changes are a benefit really - but you have to weigh these losses against the $$ gains.

As far as wheel width, that's where your issue comes in. Pirelli only recommends a rim width of 3.5-3.75" for that 180/55 - so in that regard, you're seriously exceeding the recommended mounting width using a 180mm tire.

Your call but I wouldn't do it.
Change to the rim width - apparently what I was looking at mixed up the front and rear tire specs. The 180 will mount on a 6.00" rim safely.

However, the other issues still remain - shorter tire, higher air pressures, less rubber on the ground, firmer ride, etc...
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Old 05-13-2011, 03:35 PM   #7
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Quote:
Originally Posted by honorsdaddy View Post
Change to the rim width - apparently what I was looking at mixed up the front and rear tire specs. The 180 will mount on a 6.00" rim safely.

However, the other issues still remain - shorter tire, higher air pressures, less rubber on the ground, firmer ride, etc...
Outstanding posts. Very useful. Thank you. I did NOT like your 3.75 specification. I will wait on more input from others before deciding on this.

Factor this in your thoughts and the types of riding that I will be doing... I am a novice track rider. I probably expect to spend all summer in novice before being able to bump up next year so I have ample time to spend on tires that wouldn't be pushed to the level of racers. Saddle time is the name of the game at this point.
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Old 05-13-2011, 03:43 PM   #8
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Ran my k6 1000 on 180/55's for a while.. Even did a trackday with it. Never had a problem. Take it for what its worth, but a 180/55 on a 6" rim is not like some deadly combo like some people would make you think. Is it supposed to be on there? NO. Will it work for the average rider, even for mid-level trackdays YES.

BTW I've got 2 sets of tires you can get cheap with plenty of life left. haha
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Old 05-13-2011, 03:47 PM   #9
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Quote:
Originally Posted by NitroHonda View Post
Outstanding posts. Very useful. Thank you. I did NOT like your 3.75 specification. I will wait on more input from others before deciding on this.

Factor this in your thoughts and the types of riding that I will be doing... I am a novice track rider. I probably expect to spend all summer in novice before being able to bump up next year so I have ample time to spend on tires that wouldn't be pushed to the level of racers. Saddle time is the name of the game at this point.
Yeah - that 3.75 spec looked weird to me too. Did some more digging on other sites and found the right one.

As a novice track junkie, all the more reason to not use alternate sizing. You need to become very familiar with what to expect from your bike before you start pushing it, and the handling dynamics would change radically when you moved back to the proper size. Those little measurements may not seem like much, but an extra 0.4" of rubber on the ground when you've only got a total of ~7" will make a huge difference.

I wouldn't run anything on the track other than spec sizes and spec pressures unless and until you start making a living from your track wins - and even then, let the crew engineers make those determinations based on your input.
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Old 05-13-2011, 03:51 PM   #10
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Quote:
Originally Posted by Mark06gsxr View Post
Ran my k6 1000 on 180/55's for a while.. Even did a trackday with it. Never had a problem. Take it for what its worth, but a 180/55 on a 6" rim is not like some deadly combo like some people would make you think. Is it supposed to be on there? NO. Will it work for the average rider, even for mid-level trackdays YES.

BTW I've got 2 sets of tires you can get cheap with plenty of life left. haha
Didn't say it was deadly, just that I wouldn't do it - especially as a novice.

You've got so little of the bike actually in contact with the ground - why on earth would you want to reduce that amount?
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Old 05-13-2011, 04:03 PM   #11
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Didn't say it was deadly, just that I wouldn't do it - especially as a novice.

You've got so little of the bike actually in contact with the ground - why on earth would you want to reduce that amount?
You are right in theory, but its been done before. With plenty of sucess. Like I said its not "supposed" to be there, but it works, and just fine at that.
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Old 05-13-2011, 04:07 PM   #12
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Quote:
Originally Posted by Mark06gsxr View Post
You are right in theory, but its been done before. With plenty of sucess. Like I said its not "supposed" to be there, but it works, and just fine at that.
Your , your call.

If someone is asking of input, I wont recommend something that I know is counter to the minimum recommended specs from the manufacturer.
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Old 05-13-2011, 04:44 PM   #13
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ill do a 190 /55 on a 1000 but 180/55 is good for a lil
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Old 05-13-2011, 06:25 PM   #14
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Your , your call.

If someone is asking of input, I wont recommend something that I know is counter to the minimum recommended specs from the manufacturer.
Im just curious but have you ridden on either?
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Old 05-16-2011, 04:40 PM   #15
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Quote:
Originally Posted by Mark06gsxr View Post
Ran my k6 1000 on 180/55's for a while.. Even did a trackday with it. Never had a problem. Take it for what its worth, but a 180/55 on a 6" rim is not like some deadly combo like some people would make you think. Is it supposed to be on there? NO. Will it work for the average rider, even for mid-level trackdays YES.

BTW I've got 2 sets of tires you can get cheap with plenty of life left. haha
FWIW i have ran a 180/55 before and just recently went back to stock 190/50 (no reason, just because) although i really wanted to try a 190/55. honestly i didnt feel anything noiticeably different between the 180/55 and the 190/50 BUT im just your average street rider, nothing crazy

IMO i think it depends on your uses of said tire.
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Old 05-16-2011, 05:25 PM   #16
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Thanks for all the replies...

Another question, what would most likely cause a 180 on a 6 inch rim to fail at the track? Lean or speed?
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Old 05-16-2011, 05:43 PM   #17
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BTW, I passed on that deal considering how many tires there were (9 sets). I haven't shied away from using 180's either. I just don't want to make such a committed investment in that size anymore. I want more contact long-term. Maybe 180 takeoffs for the street or the occassional relaxed trackday.
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Old 05-16-2011, 06:13 PM   #18
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If you are looking for takeoffs, just send a PM to any racer and I'm sure they will hook you up. Mark mentioned he has some, I am sure Dr. Gonzo, CDILL, Tony1k, etc will have some.

I have a set of Dunlop 211 GPA Mediums that I can sell you for 100. PM if interested.
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Old 05-16-2011, 07:11 PM   #19
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Quote:
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If you are looking for takeoffs, just send a PM to any racer and I'm sure they will hook you up. Mark mentioned he has some, I am sure Dr. Gonzo, CDILL, Tony1k, etc will have some.

I have a set of Dunlop 211 GPA Mediums that I can sell you for 100. PM if interested.
I have actually been in touch with Mark and his 180s but really... my intent with this thread was more to learn about various tire sizes available and their ramifications. No doubt 190s are the way to go but learning the whys and hows is always a plus. I really want to understand this on a deeper level. I'm tired of reading the Motorcyclist. You guys are real people who wear these routinely.

Gonzo takeoffs? Wouldn't those be melted down by the time he's finished with them? That dude is super-fast. I bet he's bent a handlebar or two pushing so hard.
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Old 05-16-2011, 07:17 PM   #20
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Mike, email john at south central race center, Sales@SCRaceCenter.com

He's got great deals on his take off's, and sometimes gives them away
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