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Just need some quick tyre advice

Discussion in 'Tyres Wheels and Brakes' started by Damus, May 14, 2015.

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  1. Damus

    Damus She is a BEAST and riding it is comparable to sex Dirty Wheel Club

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    Hi guys,

    As you probably know I have diablo rosso II tyres currently on my cbr250rr.
    The tread is getting pretty damn close to those markers that indicate they need to be replaced and I am thinking of getting another set.

    The question I have is, I am going to be purchasing them from http://www.cheapmotorcycletyres.com.au/

    there is 2 options
    110/70 & 140/70 for $300
    OR
    110/70 & 150/60 for $320

    Which one should I get?
     
    Damus, May 14, 2015
    #1
  2. kiffsta

    kiffsta Senior Member

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    I wold go option 1 with the 140 rear, thats what I ran on 2 of my old cibby's
     
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    kiffsta, May 14, 2015
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  3. Damus

    Damus She is a BEAST and riding it is comparable to sex Dirty Wheel Club

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    Thanks Kif your the man!
     
    Damus, May 14, 2015
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  4. Mike Miller

    Mike Miller Active Member

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    I agree 140 would be enough. You won't be needing 150 even you lean super low you will see that the you won't consume the whole surface area.
     
    Mike Miller, Jun 29, 2015
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  5. Mclaren

    Mclaren Well-Known Member Contributing Member

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    We use 150 on track and use it all up
     
    Mclaren, Jun 29, 2015
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  6. Damus

    Damus She is a BEAST and riding it is comparable to sex Dirty Wheel Club

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    My misses took my mc22 on the track demoloished any evidence of chicken strips off the bike with 140's haha.
    But yeah I am quite happy with the rosso II's 110/140. I think 150's is a bad idea these days.
     
    Damus, Jun 29, 2015
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  7. Mclaren

    Mclaren Well-Known Member Contributing Member

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    Y a bad idea ?
     
    Mclaren, Jun 29, 2015
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  8. Linkin

    Linkin The Mechanic Premium Member Contributing Member Dirty Wheel Club

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    Stock sizes are 100 or 110 (newer models) on the front, 140 on the rear.

    Fizzer's feel all wrong with 110/140 combo. The stock tyre sizes of 100/130 makes the bike a lot easier to steer and gives you better control at low speed/cornering etc.

    Fat tyres on a small bike = small dick syndrome!
     
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    Linkin, Jun 29, 2015
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  9. Mclaren

    Mclaren Well-Known Member Contributing Member

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    :headbang:
     
    Mclaren, Jun 29, 2015
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  10. Linkin

    Linkin The Mechanic Premium Member Contributing Member Dirty Wheel Club

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    Larger tyres means more force required to lean over the bike to the same angle. Makes the steering sluggish and heavy. At least on the fizzers...
     
    Linkin, Jun 29, 2015
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  11. Damus

    Damus She is a BEAST and riding it is comparable to sex Dirty Wheel Club

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    Well let's be logical.
    I debate 3 obvious points to begin with that I am just thinking of with common sense.
    1. Unnecessary extra weight at the rear of the bike.
    2. A wider tyre being pinched closer together deforming the intended shape of the tyre.
    3. Tyres are arguably one of the most important components of the bike, the sizing is there for a reason no doubt.

    Going out by 10 works for people, but can you tell me an advantage in a racing context outside of "more variety"?
    I honestly can't think of one.
     
    Damus, Jun 29, 2015
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  12. Mclaren

    Mclaren Well-Known Member Contributing Member

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    Mate every 250 on track runs 150 so we run slower lol
    More tyre on road more grip I ran a 140 on fzr and now a 150 on Cbr and I'm telling u I can push harder on the 150
     
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    Mclaren, Jun 29, 2015
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  13. maelstrom

    maelstrom LiteTek Staff Member Premium Member 250cc Vendor Contributing Member

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    Moto3 bikes use a 115/70 rear tyre and produce about 50hp. They are a lot lighter than a 250 production bike of course and the regulations are for a minimum weight of 148kg for both rider and bike. Now if there was any advantage to be gained by fitting larger tyres why is it not done? For the simple reason that the 115/70 is the best tyre for the job.

    Weight is a significant element in this discussion and a heavier total weight will need a larger tyre. But the bigger is better view is basically a load of rubbish. You should use the smallest tyre that will give you the fastest lap times. Assuming that it is fitted to the correct rim size. Larger tyres will make your bike slower to accelerate, slower to brake, and slower to turn. But a lot of what happens on a racetrack is psychological. If the rider thinks that a fat tyre will allow him to corner faster then he will have more confidence etc and vice versa. If I had to find the optimum size I would have appropriate rim sizes with the selection of tires and send the rider out to do laps without letting him know which one is which. Whatever he is fastest on is what we would run.
     
    maelstrom, Jun 29, 2015
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  14. Mclaren

    Mclaren Well-Known Member Contributing Member

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    Also more options with a 150 than a 140 weight well I think if ur logic is right we all be a cheese cutters setting records!
     
    Mclaren, Jun 29, 2015
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  15. Mclaren

    Mclaren Well-Known Member Contributing Member

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    So if u prefer the 140 and think the 150 is heavy and changes shape than y ask the question
    U already made ur mind up seems silly and looking to start a argument u ask got opinions and I have mine 250 are not 1000cc if u want a nice tyre to get good life and fuel economy out of go stock 140 if u want to carry corner speed which is y these are fun to ride and race go 150 like all of the guys who race that's my 2 cents so let's be logical if u want to have a discussion I'm keen but if u want to be smart mayb jump on a forum where ppl want to have digs and not get opinions from the people who try to offer the best advice they have mate
     
    Mclaren, Jun 29, 2015
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  16. Mclaren

    Mclaren Well-Known Member Contributing Member

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    U can mate :thumb_ups: image.jpg
     
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    Mclaren, Jun 29, 2015
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  17. Damus

    Damus She is a BEAST and riding it is comparable to sex Dirty Wheel Club

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    I meant there is more tyre product selection in the 150 width selection, not "smaller is better" my argument is use the size designed for the bike.

    Maelstroms post makes sense to you doesn't it?
    50hp (more hp than our bikes)
    Lighter (better power to weight than our bikes)
    Shape and size of the bike (comparable)

    I think it's easy to see that if your bike is light and under powered the stock size tyres will work better than making them bigger. To go a step further if u light weighted the bike it might be better to go thinner?
     
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    Damus, Jun 29, 2015
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  18. Damus

    Damus She is a BEAST and riding it is comparable to sex Dirty Wheel Club

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    Woah I'm just speculating not arguing. I was genuinely looking for a good reason why bigger is better. But you just said we all run 150's and you can push harder.
    All good over here *waves white flag*
     
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    Damus, Jun 29, 2015
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  19. Mclaren

    Mclaren Well-Known Member Contributing Member

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    Ok so taking the point that it was designed for bike is good if u go down that line u can argue saving weight which u have asked in another thread is against itself as the development of that bike with weight distribution was designed to run at stock weight and tyres so it all down to setup and preference
    My bike has different front springs emulators and oil which army stock so u have to adjust other things to get advantages
    Best to try and 140 then a 150 and make ur own mind up as everyone has a different riding style and as said like on fzr 140 feels better than 150 but for me other way round
     
    Mclaren, Jun 29, 2015
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  20. Mclaren

    Mclaren Well-Known Member Contributing Member

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    Also if u suspension is the same from when it new it prob shagged and any tyre is going to get ripped up and cause hassles as the feed back u receive from tyre is going to horrible compared to a well set up front a rear
     
    Mclaren, Jun 29, 2015
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