Pirelli tire selection

Discussion in 'Tech' started by Pneumatico Delle Vittorie, Jun 15, 2018.

  1. D-Zum

    D-Zum Alex’s Crew Chief

    While the gauge might not be accurate, using the same gauge consistently to manage tire pressure will eliminate inaccuracies due to the deltas between gaugeN and gaugeN+1
     
  2. tack514

    tack514 Active Member

    So what temps are we looking for then? I would just like to have another data point. The best I would be able to do would be laser temp when i get back to the pits. Would this work as an additional data point? I also understand that this will vary depending on climate/distance from track. If I do this 100% would it add any value? I am not willing (at least for now) to investing in a temp tool (plus my dumbass would jabb a hole in my tire)
     
  3. Pneumatico Delle Vittorie

    Pneumatico Delle Vittorie Retired "Tire" Guy

    I still like to look at the pressure rise right off the track as it's another check to help you manage things. In regards to compounds and ambient temps it's not cut and dried like that. As I said above fast guys can get a SC1 rear to work everywhere and in low temps. So don't worry about actual ambient temps, so when your ready to pick a compound go to your vendor and ask him for help. He'll probably say at your pace use a SC1, or SC0, or if your looking for max tire life a SC2. and you may want to reread my notes up top:D
     
  4. Pneumatico Delle Vittorie

    Pneumatico Delle Vittorie Retired "Tire" Guy

    I have probably probed 10 thousand plus tires in my career, and you know what it's not going to tell you much. It's like trying look at durometer readings at the track. Collecting durometer data is relevant in a laboratory setting and not in the pits at the Sledges. So look at hot pressures, hot pressures, hot pressures!
     
  5. Pneumatico Delle Vittorie

    Pneumatico Delle Vittorie Retired "Tire" Guy

    Ah bump again
     
    Jaketheone46 likes this.
  6. Pneumatico Delle Vittorie

    Pneumatico Delle Vittorie Retired "Tire" Guy

  7. mg15

    mg15 Member

    I have to run a 24hr endurance race on a mini, running 125gp spec 17" wheels. Looks like the temps will range from a high in the mid 70's to a low around 40 degrees. I had a bad experience trying to Diablo Rosso's at a race with temps in the very low 40's. I usually run a 110/70 SC1 front, and a 120/70 SC2 Fr or 125 rear. I was afraid that the race tire wouldn't work at those temps, so I tried the track day tire, thinking it would be far less temp sensitive. They were nearly unrideable. What's your recommendation, considering I need grip over life? The front SC1 easily goes 24hrs, and I expect one rear tire change.
     
  8. metricdevilmoto

    metricdevilmoto Just forking around

    What motorcycle?
     
  9. Pneumatico Delle Vittorie

    Pneumatico Delle Vittorie Retired "Tire" Guy

    First time for this question so I have many questions MG15.
    What track and what bike?
    And if you have 125GP wheels then you have a 2.50 wide front and a 3.50 wide rear, right?
    Finally have you tried our 125gp/Moto3 tires in the past?
     
  10. mg15

    mg15 Member

    Track is Grange Kart track, bike is a mongrel, 250F frame/85 suspension/150cc four stroke. 200lbs, 53" wheelbase, 200lb rider (5-6 riders, so varies).
    Yes, I do have 2.5Fr/ 3.5Rr. Also have a 3.0Fr I want to try. I don't care for the 125/moto3 front, it does not seem to have compliance, with so little sidewall, or air volume. Probably 400lb, bike plus rider weight, is outside range that is common on 160-180lb bike/light rider combo that they are designed for. 110 DOT Fr and 120 DOT FR on rear, or Moto3 rear both are great in more moderate temps, I was just afraid of them in the high 30's/low 40's, so I tried the Rossos.
     
  11. Pneumatico Delle Vittorie

    Pneumatico Delle Vittorie Retired "Tire" Guy

    Sorry I've been golfing a lot before the club closes for the season, but I've been thinking about this one a lot. So based on weight/weird bike and your comments I would try this. The 3.00 front wheel with a 110/70R17 sc1 slick and on the 3.50 rear wheel a 120/70R17 sc2 Moto3/125GP rear. I think the wider front wheel with the 110 may give you the compliance you're looking for. Then play with pressures a bit to see if this set up is what your after.
     
  12. mg15

    mg15 Member

    Thanks for the reply, after a few days I forgot about it, and didn't check back. I think we're on the same page. Looks like I may be stuck with the 2.50 Fr wheel, seems that the 3.0 isn't going to work out with rotor spacing. It's still a maybe, I have to see if there's another rotor, or how much I can mill.

    Latest weather forecast shows night time lows in the mid-40's, and highs in the upper 70's
     

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