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Tire cupping
- bountyhunter
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1979 KZ-750 Twin
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- roy-b-boy-b
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Cupping on my truck was from bad shocks.
I would look at everything in the suspension. Roy
1979 LTD Street Fighter.1977 KZ1000
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- Patton
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Suspect pulsing during braking, due to warped disk, would hasten the cupping.
Good Luck!
1973 Z1
KZ900 LTD
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- keith1
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Vaguely recalling something from Dunlop about front tire cupping being related to using front brake.
Suspect pulsing during braking, due to warped disk, would hasten the cupping.
Good Luck!
I remember my zx-9 having the same problem and if i remember correctly, one of my riding buddies at the time
saying something about braking in corners having something to do with it....the cupping was minimal, but you could feel it if you ran your hand over tire edge.....
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- TeK9iNe
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This cupping develops within the side wear bands of a leaned motorcycle. The extreme forces that come in to play when the bike is leaned in a turn are what produce the effect and when the wear becomes sufficient, one will experience vibration and noise when they bank into a turn.
The leading edge of the tread does not flex much as it grips the road and the rubber is scuffed off the tire in that area causing a depression. As the tire rotates, the pressure moves to the trailing edge of the tread pattern where the tread flexes more causing less scuffing so less material is ground off the tire. The more complex the tread pattern, the more complex the cupping pattern will be. The softer the compound of the tire, the sooner this cupping will develop. Radial tires are more prone to cupping than are bias ply because the compound of radials is softer.
Low tire pressure will exacerbate this wear pattern and you will lose many serviceable miles by running low. Improper balance has nothing to do with cupping on a motorcycle tire. Improper balance will merely cause your bike to vibrate within certain specific speed ranges.
Cheers!
Motorcycle Shop Owner/Operator
79 Kawie Z1000 LTD
81 Kawie Z1000 CSR
83 Honda VT750C A
85 Kawie GPZ900 A2
86 Zukie GS1150 EG
93 Yamie XV1100 E
Lucky to have rolled many old bikes through my doors
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- Kawickrice
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Cupping, which is more accurately described as scalloping, is a natural wear pattern on motorcycle tires and it will always follow the tread pattern. It is not a sign that you have bad suspension parts. It merely shows that your tire is indeed gripping the road when you make turns.
This cupping develops within the side wear bands of a leaned motorcycle. The extreme forces that come in to play when the bike is leaned in a turn are what produce the effect and when the wear becomes sufficient, one will experience vibration and noise when they bank into a turn.
The leading edge of the tread does not flex much as it grips the road and the rubber is scuffed off the tire in that area causing a depression. As the tire rotates, the pressure moves to the trailing edge of the tread pattern where the tread flexes more causing less scuffing so less material is ground off the tire. The more complex the tread pattern, the more complex the cupping pattern will be. The softer the compound of the tire, the sooner this cupping will develop. Radial tires are more prone to cupping than are bias ply because the compound of radials is softer.
Low tire pressure will exacerbate this wear pattern and you will lose many serviceable miles by running low. Improper balance has nothing to do with cupping on a motorcycle tire. Improper balance will merely cause your bike to vibrate within certain specific speed ranges.
Cheers!
Very interesting. Makes sense to me
73 Kawasaki Z1
07 HD CVO Ultra Classic
82 Suzuki GS 1100
74 Yamaha RD 350 (My two stroke toy)
77 Kawasaki KZ 650B-1 (My putt around bike)
80 Indian Moped (My American Iron)
1
Long Gone
75 Suzuki GT550
74 GT 380
79 RD 400 Daytona Special
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74 Honda QA 50
Tampa FL
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- mark1122
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- Keep twisting it
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Very good explanation. Thanks.
Where did u learn about that?
76 KZ, frame gusset work,1200CC.Ported by Larry Cavanaugh, 1.5mm.over intakes, Carron Pipe, ZRX12 rear end, and seat,96zx9 front end.
01 CBR600F4i Track bike.
Cobourg, Ont. Can.
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- RonKZ650
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321,000 miles on KZ's that I can remember. Not going to see any more.
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- mark1122
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I just got an email back from the local bike shop and he said
"Usually its an air pressure issue or balance issue.
Most tires when worn will cup though."
76 KZ, frame gusset work,1200CC.Ported by Larry Cavanaugh, 1.5mm.over intakes, Carron Pipe, ZRX12 rear end, and seat,96zx9 front end.
01 CBR600F4i Track bike.
Cobourg, Ont. Can.
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- Patton
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w6rec.com/duane/bmw/cupping/index.htm
Good Luck!
1973 Z1
KZ900 LTD
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- rstnick
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I am using Bridgestone Spitfire tires.
I will be replacing both tires this Winter, and will keep a better eye on tire pressure this time.
Rob
CANADA
Need a key for your Kawasaki? PM me
1978 KZ650 C2, 130K kms, Delkevic ex, EI, CVK32, PMC easy clutch, ATK fork brace, steering damper, braced swingarm, 18" Z1R front wheel.
2000 ZRX1100
2011 Ninja 250R
2005 z750s
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- roy-b-boy-b
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1979 LTD Street Fighter.1977 KZ1000
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