Tyre wear

[Bangbug]

Gidday guys,

Tyres are supposed to be balanced so that the rear lets go before the front.
I've got a 110 on front and 140 on back of cibby250. I have some cool looking but thought provoking wear on my front vs back. very close to edge on front (1mm maybe) but a lesser degree on the rear (out there but not much "wear").
Too much breaking into corners twisting my tyre? Or just too much city riding?

Scratch those noggins.

[Gremlin]

pictures would help... depending on wear, it can also point to your suspension. As for wearing to the edge, it depends on profile, and tyre size. Some models of front tyre are unnaturally flat, meaning you will run out of it first. Best to run out of rear before front... the front doesn't grip very well, when its on the edge.

Smaller rear profiles also tend to be much more curved.

[nadroj]

Too much late braking into corners?
Not enough throttle (weight transfer to the rear) mid corner?

[bugjuice]

balancing tyres doesn't determine which would give up first. That's to stop vibration at speed from gyroscopic effects (more weight on one side than the other).

tyre wear is down to what pressures you're running, what style of riding you're doing, how your suspension is set up, how hard you brake or accelerate.. and front wear rarely mirrors rear wear exactly, so don't worry about that.

and it's right that you get to the edge of the rear tyre more than the front. You can roll right off the edge of the rear, and still show a little left on the front.. don't fret it

[N4CR]

i had similar problems with other tyres before, when you really crank it over it will come apparent you wont run outta front also braking into corners real hard can influence front.

when i first got the diablos on the 10r i thaught i'd run outa front first, the last cm of tyre prooved otherwise, sidewall got a bit worn deforming on the left now... got 2mm front left, ain't changed much from when i wasn't off the edge. the profile should equal out.

what are you running anyway? gprs? bts?

[Gremlin]

some tyre profiles do vary. The cb900, I have 1mm left on the front, but several on the rear. Pegged it tho... so hopefully won't run out of front...

Ask weasel, on his zx4r, he had a very flat front, and quite a curvy rear.

[Lou Girardin]

Cornering on a trailing throttle will increase front tyre wear. (And feel bad)

[Grub]

That may explain things for me Lou. I corner on a maintaining throttle and I corner hard ... so now I have a front which is getting a bit pointy and is feathered but the back is like new.

[idleidolidyll]

Gidday guys,

Tyres are supposed to be balanced so that the rear lets go before the front.
I've got a 110 on front and 140 on back of cibby250. I have some cool looking but thought provoking wear on my front vs back. very close to edge on front (1mm maybe) but a lesser degree on the rear (out there but not much "wear").
Too much breaking into corners twisting my tyre? Or just too much city riding?

Scratch those noggins.

Starting at the beginning: Who says tyres are supposed to be balanced so the rear lets go first? I doubt that the tyre and bike manufacturers could build tyres or bikes that would do such a thing in any given circumstance.: we as riders are just too unpredictable and in any given situation might do something smart or something completely stupid: the manufacturers can't guess which and if they did manage to build such a bike/tyre, it'd probably piss us all off.

Firstly, as suggested by someone else, photos would help.

OK, now I reckon your tyres are not suited to the bike. A 140 rear is serious overkill n a bike with maybe 25bhp. A 110 on the front isn't so bad but I'd fit a 100 front / 120 rear combo. That'd give quicker steering for certain and would likely be a better match to the bikes characteristics.
Chances are you've fitted these tyres to the standard rims which would mean they are riding unaturally; particularly the rear. The tyres profile will have been squeezed by fitting it to a narrow rim making the sides extremely steep. Reaching the edge is probably impossible on the street.

Without seeing the wear it's hard to be sure but I suspect the tyre size/mismatch is most of the 'problem'.

Just to confirm to myself that you have a mismatch, I checked Hondas specs for the CB250 (2000 model). The standard tyres are 90/100-18 front and 120/90-16 rear. Yes, you HAVE overtyred it.

[CBobR]

Do you have the 140/60/17 (stock on an MC22) or 140/70/17 (stock on MC19)?

Also, are your tyres a matched set? Different profiles will make a difference, a touring tyre will get to the edge much sooner than a sports tyre.

I've got a set GPRalpha10s on my MC22 in stock sizes and the front and rears get to the edges at the same time.

[nodrog:Me]

isnt a 110 on the front too big? seem to recall my fzr250 was only meant to have a 90.

[doc]

Cornering on a trailing throttle will increase front tyre wear. (And feel bad)

If my throttle was trailing on enteringa corner I would get of the fu.kin thing quick.

[gav]

Just to confirm to myself that you have a mismatch, I checked Hondas specs for the CB250 (2000 model). The standard tyres are 90/100-18 front and 120/90-16 rear. Yes, you HAVE overtyred it.

Interesting I'm sure, but doesnt he have a CBR250RR? Those sizes he has fitted look right for that bike, not sure where your getting your misinformation though Mr idol?

[idleidolidyll]

Just to confirm to myself that you have a mismatch, I checked Hondas specs for the CB250 (2000 model). The standard tyres are 90/100-18 front and 120/90-16 rear. Yes, you HAVE overtyred it.

Interesting I'm sure, but doesnt he have a CBR250RR? Those sizes he has fitted look right for that bike, not sure where your getting your misinformation though Mr idol?

maybe he does but this is the info he supplied: "cibby250"

of all the CB 250's Honda made, 99% are NOT CBR250RR's.

Several people suggested he provide photos/more info. So far nothing has been forthcoming

The question therefore is this: does he really want to know what's happening or did he just want to post something online regardless of relevance?

I and others are quite happy to offer suggestions but with limited info, the answers can only ever be just as limited

[Bangbug]

Ahhhhhhhhh...........mission accomplished :P
Sorry to be a bastard all but damn i feel better now :P
As for overtyring the bike. nope, i can't read japanese but i can read a blueprint and she's shod with her native rubber. (note avatar)
FZR's have smaller tyres correct nodrog, but we'll leave 250 banter to where it belongs (in the corner with me and the rest of the other poor bikers who can't afford a larger bike)