Tyre profile, 50 or 55?

Discussion in 'General 1000RR Discussion' started by sinewave, Apr 4, 2013.

  1. BladeWitch

    BladeWitch New Member

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    gidday sine - ive always believed the best insurance you can have is damn good tyres - good types can avoid you having to make an insurance claim in the first place - i run a pirelli rosso corsa 55 on my rear, the profile and size is the best insurance i could ask for considering my type of blade riding - i wouldnt go back to the 50 if you paid me.
     
  2. CeeBee

    CeeBee Active Member

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    Another 55 convert, you will not regret it
     
  3. Swiss T

    Swiss T Active Member

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    I will be selling a diablo corsa 3 in a 190/55 soon if anyone wants to try it on the cheap. I have had the tyre on for around 500 miles but i'm replacing the set with sport touring tyres. Its got to be worth around £60 to someone.
     
  4. mekanix

    mekanix Active Member

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    Sorry guys, been manic the last couple of days, will get some pics on over the weekend. Simon, pop up and have a lol mate, you're in Grantham. As for the extra height, I really feel it makes it feel more sporty as it brings the rear up ever so slightly and I'm not exaggerating when I say the handling has improved massively. I ride pretty hard and there's a particular section of road where i love to throw the bike in on the A607 just out of Navenby. It's a beautiful down hill chicane and I just get faster and faster and the tyres haven't even thought about letting go on me. I haven't used them on the track yet but I'm excited about how good they'll be.
     
  5. mekanix

    mekanix Active Member

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    South Kesteven-20130901-00292.jpg South Kesteven-20130901-00294.jpg

    Right, as promised, here's the pics of the 200/55 on the rear of my Fireblade. Did a track day today at Cadwell, first time I've used these tyres and first time I've used my Blade on the track and WOW, I am so impressed with them. Just confirmed that I will never use any other tyre and am a 55 convert myself, especially with the 200.
     
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  6. SimonRR

    SimonRR God Like

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    I went with 190/55 in the end, and like everyone says on here, they feel great and I won't be going back to 50 again :)
     
  7. notsogreen

    notsogreen New Member

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    I put 190/55's on the back of mine. They were actually ordered by accident in a way. Bobs tyres in Stevenage (Awesome guy, although he has a Blade Repsol, dont hold that against him lol) ordered the 55 by mistake. I was a bit like "Well, will it be ok !?" and after a lot of research found out that a lot of other manufacturers put them on as standard where as Honda do not.

    Now Im not a mega experienced Sports bike rider having had my baby since July and whacking over 2000 miles on here lol. But I am getting lower and lower every day, almost scrubbed off the strips on my rear 55 which in itself is a little harder than on a 50.

    I find the bike incredibly easy to turn into the corners and having done several roundabout repeats over the last couple of months :D find the poise of the bike when over and going in and out of corners incredible. Much much better than the 50's in my limited experience.

    Couple that with the suspension setup that i had done at MSG racing in Aston Clinton and the handling has been absolutely transformed.

    I will NOT be going back to 50's.

    Hope that helps a little

    :D:eek:
     
  8. navvy10

    navvy10 Well-Known Member

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    Shut up and buy the beers soppy b*ll*x :D
     
  9. Edward VH

    Edward VH Active Member

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    Just wondering if this is right... yes the bike goes quicker because the circumference of the rear tyre is larger with a bigger profile, but is the speed measured by the front wheel? If the radius of the front wheel remains the same, then speed should read correctly regardless of rear tyre profile.
    That said, if the speed is read by the gearbox (like in a car) then yes it would read slower.

    Sorry, I don't have my blade yet, so don't know how the speedo is driven. On my Suzi, it's at the front wheel.

    .
     
  10. SimonRR

    SimonRR God Like

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    Its measured of the engine
     
  11. Fezza

    Fezza Active Member

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    So someone is running a 200/55? Is anyone else doing this?

    My rear Rosso Corsa is due for replacement soon and i'm intrigued by thoughts on a 200/55?
     
  12. Andy

    Andy Active Member

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    I guess I have been quite fortunate, I was completely unaware about using a 55 profile tyre.

    I have had my blade just over a month now, when I first went to view at the dealership I was checking it over and chatting with the sales person we agreed the rear tyre was past its life and although the front was legal but worn, the dealership would fit a new rear and I would pay for a new front so I could have a matching pair of my choice.

    I never gave a thought to what size could be used and just presumed it would be a standard 50 profile, well I'm guessing the dealership must of looked at the size the tyre the bike had on and just ordered the same size as my rear is a 55 profile, so the person who owned the bike before me must of knew what they were doing when they came to changing the rear tyre.

    So I'm running a 55 but only out of pure luck, but wouldn't change now after reading this thread and happy with the way it handles
     
  13. sps170373

    sps170373 Moderator
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    I've made the swop today to 55 profile with some Pirelli DRC'S so far so good like most have said it will take a bit more to clear the chicken strips
     
  14. Haggler ®™

    Haggler ®™ Active Member

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    Just to put a spin on the situation , just because it's a 55 profile does not necessarily mean it's bigger than some 50 profile tyres. I've just removed a 50 profile Power Race and fitted a 55 profile Power Pure and they,re the same dia ie height side by side. Depending on the make the diameter could be same or as near as dam,it when sitting side by side.
     
  15. Souleh

    Souleh Active Member

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    65 my fav :D
     
  16. mekanix

    mekanix Active Member

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    I am inclined to agree with this, cos if you were to look at a touring tyre, it's not as domed as a race or sport tyre so the rolling radius could still vary depending on the brand or model of tyre.
     
  17. sinewave

    sinewave God Like

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    This is true solely because a Bike Tyre is domed to the OEM design.

    A Car Tyre is Flat across it's width so mathematically it's impossible for a lower profile tyre of the same wheel diameter to have a rolling Circumference the same as the next size up profile, it will always be less.
    Hence when dropping a profile size on a car you go up a size on the rim diameter to keep the same rolling circumference.

    This sticky link I posted on the Merc forum is a good tool for car wheel mods!
    On screen Wheel offset(ET) calculator - MBClub UK - Bringing together Mercedes Enthusiasts


    The profile is a percentage of the width.

    So using the Wife's Merc as an example the rear tyres are 265/30/19
    Therefore the tyre wall height from the rim to the surface face of the tyre is 30% of 265mm

    On a bike Tyre the wall height is measured the same, however the tyre is not flat across so the 'dome' or arc or the Tyre differs between OEM so therefore the overall rolling radius can differ quite significantly because of this.
     
    #57 sinewave, Sep 4, 2013
    Last edited: Sep 4, 2013
  18. The.kickboxer

    The.kickboxer Active Member

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    So going from 190/50 to 200/55 affects it doubly by increasing the width and depth percentage numbers. This is interesting in the face of the comments about tip in being easier. Is this due to the relationship with the front wheel circumference? A bit like when Honda 900 blades ran a 16" front wheel to get them to tip easier, or was this due to a lesser gyroscopic effect of a smaller rotating mass?
     
  19. hump333

    hump333 Member

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    I personally prefer 190/ 55 to the 190/ 50 due to my weight an my riding style.
     
  20. SimonRR

    SimonRR God Like

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    here are my 190x55, they are Pirelli Diablo Rosso 2
    They do feel better than my old 50's though and will change to Pirelli Diablo Rosso Corsa in time for the next year track days :)
    wouldn't mind Supercorsa but most of my miles are on road, so can't really justify the price of the supers ;)
     

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    #60 SimonRR, Oct 28, 2013
    Last edited: Oct 28, 2013

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