Author Topic: Changed rear tire - weird feeling  (Read 1427 times)

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  • Offline CT_Ron

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    Offline CT_Ron

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    Changed rear tire - weird feeling
    on: Feb 20, 2020, 02.36 pm
    Feb 20, 2020, 02.36 pm
    Question:
    Do mechanics do anything with the rim spokes/spoke torque values when they change a tire?

    Story:
    I believe I had around 50% left on my rear Continental ContiTrailAttack 3 when a f-ing rusted screw murdered it in cold blood two days ago. Thought my caliper was stuck. Pushing the bike out the garage felt like a strongman competition. I figured I'd drive away to break the caliper loose, as I was now running late for work. First corner was enough to figure out what was going on.

    I dismounted the rear rim, threw it on the back of my bicycle and off I went to get the same Conti tire fitted (workshop is right next to my workplace :020:) I reassembled the rear rim yesterday and went to work today. I could really feel that new roundness of the rear and a much better 'flickability'. I pushed the bike left and right until I arrived at work. No problems at all...

    I let the workshop check my nut torque values and had them set it to exactly 108nm as I don't own one of those overpriced torque wrenches. I had tighten it slightly under factory settings. When torqueing was done, a fairly confused man interrupted us outside the workshop and sort of forced us to join his religious cult shouting I need this for my own protection or "I'm gone, I'm gone, I'm gone!" (I refused).

    I went home. When I came of a long and almost private exit ramp after have ridden 10/15 minutes, while I was cornering and doing 160kmph/100mph like Valentino Rossi's slower brother, the moment I let of the gas in 5/6th gear I thought my rear came off. It felt like I was sliding for a second or two but I wasn't. It scared the F out of me. And either I'm going crazy, but I thought I felt it during a slow corner too a few minutes later. I checked if the damn rear came loose, but it didn't. Rear rim was tight as can be. Pushed the rear wheel front and back, sideways. I pivoted the bike on it's center stand while pushing, so the rim really was bolted down to the drive shaft. Absolutely no movement.

    I did the same thing as I always do when I take that exit ramp: Go in hard as it's a beautiful corner > let off gas > come upright > break. I had about 40km/24mi on the new tyre. It's a Continental who claims break-in time is very short because they don't use any release solvents/oils. I'm a firm believer as they also claim warm up time is less than a mile, which is true. And this is my third ContiTrailAttack set.

    What can be the cause of this weird sensation during cornering/deceleration. Does Continental lie and is it still a slick tyre? Did the mechanics do something with my spokes when they changed rubber? Am I just stupid for not noticing these forces before? Did the last torque check do anything to my rear rim? Did the crazy man cast a spell on me for refusing his invitation??? Was it a combination of all of the above or am I being hyper alert?

    Specs:
    - 2.6 bar front (2.5 factory).
    - 3.0 bar rear (2.9 factory).
    - rear preload set to max as I'm a heavy guy.
    - front about medium preload and also running Conti's TA3.
    Last Edit: Feb 20, 2020, 02.53 pm by CT_Ron

  • Offline Banksy

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    Offline Banksy

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    Re: Changed rear tire - weird feeling
    Reply #1 on: Feb 20, 2020, 04.49 pm
    Feb 20, 2020, 04.49 pm
    Think I'd get another 25/30 miles on the tyre first. 24 miles sounds a bit quick for a proper scrub on the tyre..

  • Offline oskar

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    Offline oskar

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    Re: Changed rear tire - weird feeling
    Reply #2 on: Feb 20, 2020, 09.00 pm
    Feb 20, 2020, 09.00 pm
    Is the direction of rotation of the tire in the correct direction?

    With the motorcycle on the center stand, does the rear wheel rotate freely without friction on the rear caliper?

    Or maybe 40 km of taxiing are few to remove the paraffin that the new tires carry.

  • Offline Superjeap

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    Offline Superjeap

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    Re: Changed rear tire - weird feeling
    Reply #3 on: Feb 23, 2020, 10.21 am
    Feb 23, 2020, 10.21 am
    Too much tyre-lube used for mounting the tyre on the rim?

  • Offline Martymouse

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    Offline Martymouse

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    Re: Changed rear tire - weird feeling
    Reply #4 on: Mar 06, 2020, 02.45 pm
    Mar 06, 2020, 02.45 pm
    I would go for Banksy's view. 
    Whilst a new tyre/tire is rideable, it needs a good 100 miles or so of slightly less frenetic riding to fully scrub it in.
    Puch125, CD175, CB175, C90, CB100, CB900, VF750, K100, CBR1000, CBR1000, DR650SE, RF900R, Bayliner, RF900R, Super Blackbird, Piaggio X9 125, Burgman 650, Hayabusa, VFR1200F, VFR1200X, F800 GT,

  • Offline Matlock   gb

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    Offline Matlock

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    Re: Changed rear tire - weird feeling
    Reply #5 on: Mar 06, 2020, 11.02 pm
    Mar 06, 2020, 11.02 pm
    Yep, assuming the wheel is fitted correctly, the tyre rotation is correct and the tyre isn't covered in tyre fitting lube, my guess is that it will just be too much, too soon for the new tyre.
    My tyre fitter, who has worked in the industry for many years, reckons you should "run in" a tyre for at least 100 miles, gradually increasing acceleration, braking force and lean angle as you progress. Also go through at least two heat cycles e.g. ride, allow to cool, ride again, allow to cool. That advice has certainly worked for me over the years.

  • Offline CT_Ron

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    Offline CT_Ron

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    Re: Changed rear tire - weird feeling
    Reply #6 on: Mar 06, 2020, 11.48 pm
    Mar 06, 2020, 11.48 pm
    Thanks all. The weird feeling has been solved. It was a combination of several factors: indeed what everyone is saying, run in was still too short despite Continental saying it's super short, cold weather, obviously too much throttle and my rear preload being maxed out, yet my front on the soft side made it all feel weird at the same time.

    I actually felt it again just now coming back from work at 00:45, with temperature near freezing point. I felt like I was sliding sideways again. That corner is very weird...

     



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