Old 9th September 2010, 11:44 AM #1
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Question So...tyre height

Whats the advantage of opting for a 190/55 rather than the stock 190/50 for the rear of the blade...is it simply effecting the turn in?
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Old 9th September 2010, 03:20 PM #2
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Re: So...tyre height

Quote:
Originally Posted by Don_Juan View Post
Whats the advantage of opting for a 190/55 rather than the stock 190/50 for the rear of the blade...is it simply effecting the turn in?
I reckon you could turn sharper as you have more tyre wall grip, as it is taller ?
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Old 9th September 2010, 03:22 PM #3
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Re: So...tyre height

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Originally Posted by gerc View Post
I reckon you could turn sharper as you have more tyre wall grip, as it is taller ?
i actually looked into it and your rolling circumference of the tyre is slightly longer with the higher wall and also its a "little" more comfortable as opposed to more feeling through the lower wall
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Old 9th September 2010, 06:46 PM #4
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Re: So...tyre height

It raises the rear, and slightly lessens the rake angle of the front forks. That allows for quicker turn in/steering movements, but also makes the bike less stable at high speeds, and at low traffic speeds.
I threw a 55 profile race take off tyre on the back of mine (although my front tyre was part worn at the time), and the first thing I noticed was how much more difficult it was to keep the bike in a straight line at low speeds. I was told it's a similar effect even with two new tyres.
(actually the first thing I noticed was that I could barely throw my leg over the bike with the added height!)
As you mentioned, the overall circumference is increased, so therefore, acceleration is reduced, while top speed is increased, both slightly. (and it's harder to pull a wheelie!)
One benefit is, apparently, the 55 is stretched in fitting so that it offers a larger contact patch when you're leaned over than a 50 profile. This means you can apply more power when leaned over, and have more grip/get more power to the road through corners.

So, quicker steering, and larger contact patch on lean.
The higher stability offered by the 50 is probably why they fit that as standard.
Bikes that come with a 55 standard would have their geometry already suited to that size tyre, if you get me.

imo, bikes like the R1 (that everyone complains about sore wrists from), and possibly the CBR 1000RR, already have their geometry suited for quick turn in, and may not require a 55 rear as much as say, the GSXR1000 K5/K6, which has a low seat height in relation to the handlebars.
Thats just my (limited!) opinion though, and they may still benefit greatly from the larger contact patch on lean.
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Old 9th September 2010, 07:30 PM #5
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Re: So...tyre height

Decent post Kneeslide, as good an answer as we could expect
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Old 9th September 2010, 07:41 PM #6
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Re: So...tyre height

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Originally Posted by Don_Juan View Post
Decent post Kneeslide, as good an answer as we could expect
I'd say try one for yourself, with the above in mind.
I ordered a 55 rear recently but it was a day late,
there was a bit of rain forecast and I already had the wheels off so I said feck it, and went with the 50 they had in stock!
Said I might get a 55 next but I'm delighted with what I got
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Old 9th September 2010, 07:51 PM #7
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Re: So...tyre height

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Originally Posted by kneeslide View Post
I'd say try one for yourself, with the above in mind.
I ordered a 55 rear recently but it was a day late,
there was a bit of rain forecast and I already had the wheels off so I said feck it, and went with the 50 they had in stock!
Said I might get a 55 next but I'm delighted with what I got
yip, will try one for the craic and see what i think
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Old 10th September 2010, 01:13 AM #8
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Re: So...tyre height

9.5mm. That's the difference.
The 50 in a 190/50 represents 50% of the width of the tyre therefore 190mm wide and 95mm high, going to 55% gives a height of 104.5mm so the bike and as mentioned before the seat height will increase by the same amount, roughly, as you're only raising the back and not the front as well.
Rather than buying a tyre and maybe not liking the feel of the bike with the changed angle you could try dropping the yokes by seven or eight mil which should give you an idea of what the bike will be like. Then make a decision as to which tyre you'll feel more comfortable with without spending, just watch out that if your the type of rider that runs to the absolute limit that with the yokes dropped you will have a slight reduction in ground clearance as well as a bike that drops to that ground faster!!

Last edited by Maxav; 10th September 2010 at 01:18 AM.
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Old 10th September 2010, 02:49 AM #9
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Re: So...tyre height

Quote:
Originally Posted by Maxav View Post
9.5mm. That's the difference.
The 50 in a 190/50 represents 50% of the width of the tyre therefore 190mm wide and 95mm high, going to 55% gives a height of 104.5mm so the bike and as mentioned before the seat height will increase by the same amount, roughly, as you're only raising the back and not the front as well.
Rather than buying a tyre and maybe not liking the feel of the bike with the changed angle you could try dropping the yokes by seven or eight mil which should give you an idea of what the bike will be like. Then make a decision as to which tyre you'll feel more comfortable with without spending, just watch out that if your the type of rider that runs to the absolute limit that with the yokes dropped you will have a slight reduction in ground clearance as well as a bike that drops to that ground faster!!
This lad here reckons the best way to go on a 04-05 1000RR is the larger 55 rear, and raise the front on longer forks.

http://www.rogueracing.org/ohlinsforks.htm
Quote:
Furthermore, the Ohlins forks allow you to raise the front end of the bike up higher than stock & while this sounds bass-ackwards to what we normally have to do to make a sportbike handle this is exactly what the 1000RR needs to make it change direction quickly during highspeed left-right transitions using the current trend of taller race tires we are getting.


That would say that he likes the standard geometry (except higher at both ends), but uses the 55 tyre for the grip, or the shape of the curve on it (or just because some of the better rubber only comes in those sizes)
There's not much scope to go upwards on the standard forks, maybe 1-2mm
Sure the tyre will only last cupla thousand miles anyway, and they're only a small bit more expensive, nothin wrong with tryin it
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Old 10th September 2010, 03:05 AM #10
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Re: So...tyre height

all about the profile and turn in rate!
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