rear tire is it possible to install a 150/70/17

Discussion in 'Yamaha 250cc In-Line 4's' started by freakengine, Dec 13, 2005.

  1. freakengine

    freakengine New Member

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    Rear tire is it Possible to install a 150/70/17 metzeler tires
     
  2. Casso

    Casso New Member

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    why would you want to?
     
  3. FZR Dude

    FZR Dude New Member

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    Yeah, you "could". BUT you'll sacrifice handling because of it.
     
  4. super_poopra

    super_poopra New Member

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    It'd be a very tight squeeze
    I have a 140 section rear tyre and it JUST fits, infact its rubbed a bit off my chain guard :/
     
  5. koma

    koma New Member

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    To be honest, i doubt it would fit.
    On a 3LN it'd be a tight fit... on a 2KR it would be horrific!

    As super_poopra said, larger than a 140 rear will more often that not cut into the chain guard, and possibly even come into direct contact with the chain!? Either way, not good.
     
  6. Casso

    Casso New Member

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    I recently made a change from a wider profile tyre to the correct profile, and you have no idea how much better the bike feels.

    If you look at the design of a tyre, the rubber is thicker in the centre, and considerably thinner on the edges. What this means is that squeezing a wider profile tyre onto a narrower wheel will cause the tyre to flex predominantly on the edges, not evenly across the entire profile.

    This means that instead of leaning smoothly, the bike will reach a point where the curve of the tyre changes and it will tip over un-predictably. It also means that the further over on the tyre you go the smaller your footprint will be (and face it, the side of the tyre is where you need the biggest footprint).

    It also means that, due to the more extreme curve of the tyres at the edge, there will be a strip of tyre on the side that is physically impossible to reach. In other words you will have permanent chicken strips 1 to 1.5 inches wide that are impossible to get rid of.

    To sum up, the wider tyres may look cooler when they’re new, and the rubber may be stickier. But you’ll end up with fat chicken strips that you can’t get rid of, the bike will handle unpredictably, and you’ll have less available traction than you would with harder tyres that are the correct profile.
     
  7. koma

    koma New Member

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    Bahaha... chicken. <!-- s:lol: --><img src="{SMILIES_PATH}/icon_lol.gif" alt=":lol:" title="Laughing" /><!-- s:lol: -->
    On my ex-3LN-3 i had a 140 profile on there and had no problems at all with any of the issues you mentioned. The tyre would roll very smoothly (possibly smoother due to the extra width!) across from side to side, as well as very easily (possibly too easily!) getting to the edge of the tyre. I found it far more difficult to get the the absolute edge of the 130 profile, but found the extra width and weight of the 140 to stabilise things slightly.

    That said, when running with the 130 i had the rear preload set to 4/5, and with the 140 rear i was running 6/7 to compensate for the slower tip in rate.

    In the end, with the chicken strips... most of the time the tyre's will happily take the abuse you give them - right down to that last 0.5cm on the edge. If you've got chicken strips then it's simply telling you that you've got 'this' much in reserve beyond the extent your pushing the bike and tyres at present; not necessarily a bad thing.
     
  8. Spook

    Spook New Member

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    well we're obviously not all so gifted koma <!-- s:rofl: --><img src="{SMILIES_PATH}/icon_razz.gif" alt=":rofl:" title="Rofl" /><!-- s:rofl: -->
    With a 130 rear on my 2kr (standard is 120) i can't get near the edge (still around 1-1.5cm to go). And thats on track days leaning the bike until the boots scrape. Maybe its my saggy suspension or my ~80kgs, but either way i just run out of ground clearance well b4 the extra width tyre gets to the edge.
    Then again, maybe i just suck. <!-- s:???: --><img src="{SMILIES_PATH}/icon_confused.gif" alt=":???:" title="Confused" /><!-- s:???: -->
     
  9. TBone

    TBone New Member

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    you all fail to mention what profile the tyres are?? a 150/70 will behave ddifferently than a 150/60 ! and same goes for the cheeken strips...
     
  10. koma

    koma New Member

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    Hehe... well boots touching down should never happen if your riding the twisties/track properly as you should move your feet up so the balls of your feet are on the pegs with your heels tucked in against the heel panels.

    As for the saggy suspension, that also makes a pretty big difference. With the preload wound down your likely to scrape peg (not boot, actual peg) before you get to the edge of the tyre on the little FZR 250's. With the preload up to ~6-7 you get a sizeable amount more clearance making it easier to crank it over that bit more.

    <!-- s:cool: --><img src="{SMILIES_PATH}/icon_cool.gif" alt=":cool:" title="Cool" /><!-- s:cool: --> <!-- s:lol: --><img src="{SMILIES_PATH}/icon_lol.gif" alt=":lol:" title="Laughing" /><!-- s:lol: -->
     
  11. Bizz

    Bizz New Member

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    Ahh, so if I up the preload to that 6/7 i'll have a bit more ground clearance then I wont scrape my pegs as easy.. Therefore i'll eat those chicken strips away pretty soon....

    Well, once my head gasket is fixed!

    <!-- s:lol: --><img src="{SMILIES_PATH}/icon_lol.gif" alt=":lol:" title="Laughing" /><!-- s:lol: -->
     
  12. dave

    dave Well-Known Member

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    I am running this 140x70 tyre on a 2KR. It doesn't go near the chain or anywhere else.
    I have never scraped the hero pegs and have about 20-25mm chicken strips. <!-- s:oops: --><img src="{SMILIES_PATH}/icon_redface.gif" alt=":oops:" title="Embarassed" /><!-- s:oops: -->


    [​IMG]
     
  13. koma

    koma New Member

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    140x70 is huge!?
    No wonder your having trouble getting to the edge of the tyre with a sidewall height like that!
     
  14. dave

    dave Well-Known Member

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    The tyre was brand new on the bike when I bought it from a dealer.
     
  15. TBone

    TBone New Member

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    and the dealer stuck some tyre that he had hanning around... not giving a hoot about safty... all dealers assume that if they sell a 250 it will be wreaten off b4 the owner notices that he has the wrong or old tyres... seen this time after time..
     
  16. dave

    dave Well-Known Member

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    Having said all that, the tyre has never let me down (no pun intended) in 5000km of riding over 8 months and in all weather.

    Of course I have no way of comparing against a correct size one until the tyre wears out and I have to put a new one on.
     
  17. imense

    imense New Member

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    dave did u use 140/70 tyre on the original 2kr rim or u changed it also?i have 120/70 on my 2kr original rim can i use 140/70 tyre on it?what about 150/70?
     
  18. dave

    dave Well-Known Member

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    The tyre is fitted to the original rim. The compliance sticker does say to only use a max of 130 and is probably good advice

    Going oversize means the tyre has so much fold on it, that it is impossible to use all the tread on the side and therefore you are paying for rubber that you can't use and grip that you wont get.
     
  19. super_poopra

    super_poopra New Member

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    Really?
    When i go for a good ride in the mountains i'm left with no chicken strips on my 140\70 rear tyre
     
  20. koma

    koma New Member

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    I know when i had my 140 profile on the rear of the 3LN i ran out of tread quicker than with the 130. That said, i can't remember what the profile heights were... so that probably had a lot to do with it.
     

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