Tankslappers at 140mph+ WTF!

[lllN30lll]

right, i regularly blast my bike to stupid speeds, I also wheelie a lot which means the front goes from 0mph to 140mph within a split second which balds out my front tyre badly.

it was a 2ct but have now replaced it with a Michelin Pilot Sport. 90 miles later it still has the nobbled on it in the middle etc. BUT when on 2 wheels travelling at anything over 140mph the bikes head starts to shake vigorously as if it doesn't agree with it.

what's gone on? it was balanced at the shop, and they put the tyre pressures in (not sure what though)

should I do a few more miles before going 140mph again?

cheers
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Turbo R1
CRF450R

[G]

Check your tyre pressure first.

A different profile may have changed the geomtry which along with the different shape of the tyre could possibly cause something this to happen.

My triumph race bike shakes at those sorts of speeds if the steering damper isn't turned up.

[lllN30lll]

i've got the stock R1 damper on and it's not too bad, would much prefer an Ohlins.

been maxing it out no problems so no idea why its started to do this after a tyre change.
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Turbo R1
CRF450R

[stinkwheel]

More what I'd call a speed wobble. Probably the rear tyre is underinflated.
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“Rule one: Always stick around for one more drink. That's when things happen. That's when you find out everything you want to know.”
I did the 2010 Round Britain Rally on my 350 Bullet. 89 landmarks, 3 months, 9,500 miles.

[lllN30lll]

ever since these slappers have begun i've noticed my rear is starting to shred down the middle of the tyre. It might just be a coincidence.

i'll be going to work down the twistys from now on.
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Turbo R1
CRF450R

[bish777]

Certain bikes dont like certain tyres Ive found.

My XBR500 was horrid on BT45s but great on Metzeler ME33/ME550s.
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GSXR1100J

[Noxious89123]

Check tyre pressures often, always check mine before a long ride.

Don't trust fuel station air pumps, they're f**king shit. I use a £7 foot pump i got from Machine Mart, along with a high quality pressure gauge that i got off my grandad.
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'06 Honda CBR125RW-6 ~ '00 Honda CBR600F-Y ~ '07 Honda CBR600RR-7 ~ Bikeless
'53 Ford Ka 1.3 ~ '03 Vauxhall Astra SRi 1.8 ~ '52 Vauxhall Astra SRi 2.2 ~ '53 Vauxhall Astra GSi

[craigs23]

Shot head race bearings from repeated wheelie landings?

[G]

[Kickstart]

Hi

Err, what do you mean about the middle of the back tyre shredding?

I would say check the new tyre. Check the bead is fully seated. Check the wheel bearings. Check the tyre is going the right way. Check the rear end as well.

All the best

Keith
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Traxpics, track day and racing photographs - Bimota Forum - Bike performance / thrust graphs for choosing gearing

[LUXY DJ]

wouldnt the `shaking` be from it still being on the bobbly bits so @ 140 + there gonna be felt ALOT!

pull em out & then see
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GSXR750
(FAR FAR from standard) www.gixerjunkies.net

[Dom_]

The A50 isn't exactly the best surfaced road for doing 140 on, try somewhere smooth n see what thats like.

[jacqui]

[Scouse]

[Pete.]

[rezzin]

Are front and back tyres the 'same'. I.e,same model of tyre?

[ken]

Are you sure it's not you N30, I mean, 140mph maybe you're clenching your butt cheeks, and starting to shake at them their high speeds

or it could be a miss match tyre selection and as said tyre pressure.
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latest bike 03 R1 in zee red and black

[Noxious89123]

Tell your pillion to stop dancing
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'06 Honda CBR125RW-6 ~ '00 Honda CBR600F-Y ~ '07 Honda CBR600RR-7 ~ Bikeless
'53 Ford Ka 1.3 ~ '03 Vauxhall Astra SRi 1.8 ~ '52 Vauxhall Astra SRi 2.2 ~ '53 Vauxhall Astra GSi

[Lanny]