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Tire size for SV650s

Discussion in 'Track Time' started by fijiman, Mar 11, 2009.

  1. I know people have preference on bands, but what tire size do you use on your sv650 at the track, 2nd gen? Pros & Cons? Feel free to advice on brands as well as some have different profiles more suited for the SVs…I got an 06 turning into a track-only bike…

  2. isnt it a stock 160?
    id stick with that.

  3. whatever you do, put a 120/70 on the front instead of the stock 120/60
  4. That is the first mod I have heard of so far for the front...:mfclap:
  5. Yep, stock comes with 160/60 - for the rear and 120/60 for the front...
    Most say to go to a 120/70 front to help turn faster? But does that require corresponding change for the rear or leave it stock?
  6. You adjust the geometry a bit to compensate for the different tire size by either lowering the front or raising the rear, but the rear tire size stays the same.
  7. 06 turning into the track bike.... Need parts? :)

    FWIW I had grave setup problems with D211 front. Everything was working well on Supercorsas but they're mushy.

    Rear shock that is adjustable for height helps since unlike GSXR's there's no way to shim the upper shock mount.
  8. Take that thing over to GP and have them dial it in for you… they’re even offering a PNW discount until May. Best money you will spend on the bike!!!
  9. PeteN95

    PeteN95 Moderator Staff Member

    The 120/70 is taller than the 120/60 and therefore will give a more relaxed, stable, or slower steering geometry. To correct this, slide the fork tubes up in the triple clamps approximately 10mm. FYI
  10. Sportrider has some good articles on their website about how different tires sizes effect aspect ratio, contact patch when riding etc... which is what you are trying to maximize when you get into turns etc, if you look at a tire that has grooves in it after a track day you can see where the contact patch is wearing during hard braking, decelerating and accelerating while cornering.

    I may have Just told you more than I actually know about the subject but it's what I've observed.

    Check out the website.
  11. I run 120/70 on the front and love it. Standard 160 in the back.
  12. Thanks guys for all the advice…I think I might go with the 120/70 for front, get the suspension setup at GP…!:mfclap:

    Oh, and BTW, any tire brand/type preference for SV for track? I know it is personal preference, but let me know your thoughts for track…specifically for the SV…
  13. If you are a straight hwy rider go with:
    120/60ZR17 front
    160/60ZR17 rear

    If you like to lean into corners go with:
    120/70ZR17 front
    160/60ZR17 rear

    Reason to go with the 70 in the front would be that your bike will be more agile in the corners however you'll lose a little bit of the stability a flatter profile tire brings. So you'll lean into corners faster but you'll have to use about 5% more effort to ride in a straight line on the hwy. Your contact patch will be a little smaller as well so your brake distance may be a tad bit longer...not that you would notice.

    I've ridden both and I'm going with the 70 in the front all the time. The benefits of the tire outweigh the negative aspects of the change.
    Last edited: Mar 12, 2009
  14. I ran Michelin Pilot Powers on mine, loved them.
  15. the chemist

    the chemist ducatiduane

    fwiw, when my brother got his old f3 track bike (160 rear)....the guy had a 180 slick on it.

    there was probably half an inch of unused tire on each side. not because the guy was slow....but because it pinched the tire so far it could NOT be used. so yea....160
  16. PeteN95

    PeteN95 Moderator Staff Member

    I think you are confused? The 70 series is taller, height is 70% of 120mm vs. 60%. This will increase rake and trail, slowing steering and increasing stability, if no other changes are made. More effort to ride in a straight line?? :shock: I can ride in a straight line without even holding onto the bars at all! How much effort could it take and unless you forgot to balance the tire, I can't see how the tire would make a difference?!? The contact patch will be slightly longer for a taller tire. FYI
  17. That's probably about the front tire profile since geometry can be compensated for. Mine was bottoming out though with AFAIR 13mm of the fork showing up above the triple - quite a nasty feeling when the bike starts bucking wildly on the brakes into T2.
  18. PeteN95

    PeteN95 Moderator Staff Member

    Bottoming against the fender? Were you hitting the fender so hard against the lower triple that it pushed into the tire? Profile varies more between brands than between sizes, so that isn't really a factor.
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