GPZ500s - BT45's - mileage

[Simple]

Right,
just noticed my tyres are on the centre markers
the tyres at BT45's, the bike is a gpz500s with a 33bhp kit in, it's making 31.1 bhp.

They tyres were supposed to last alot longer than 5800 miles which is what I've done since March when they were put on...

just wondered if this is right? I'd have expected alot more mileage...

MOt is due August.. and I'm peeved at the thought of cash on tyres that was for a track day

any input appreciated

Thanks
Simple
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Insta - FemFeral

[Irezumi aka Reuben]

Would have thought at least double that is possible, depends how you ride. Have you been keeping an eye on your pressures as well?

Done a couple of thousand on my sqaured off rear and it's barely made any difference. This tyre has done over 10,000 now.
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Pictorgraphicalfantastical

[sickpup]

You're doing someting wrong. I would expect 10,000miles out of the rear and about 14,000miles out of the front.

Show a pic of the wear please.

[extreme3d]

The most common casue for poor life expectancy from a tyre (besides very harsh use/burnouts ) is incorrect tyre pressure. After that it may be allignment, but on a bike you can usually tell this when you ride either by feel or looking down at your yolks.

As Sickpup says, supply a pic showing the wear in as close detail as possible.

[Simple]

I keep on top of pressures, so thats not where I'm going wrong.

The front isn't at the markers yet, and has odd wear, this I know is caused by a bent bottom yoke.

the rear.. I cant see a reason for it wearing so quick,

I havent done a single burnout on this bike, and harsh use isn't really possible with the restrictors in, the chain has been adjusted once in over 8000miles... so harsh use..I think is also out of the running?

willget pics

simple
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Insta - FemFeral

[TheShaggyDA]

What tyre pressures are you running at?

BT45s originally had a recommended psi of 29 front and 33 rear, (albeit on a CB500, but I don't see it being that much different to a GPZ) but Bridgestone altered that to 36 front and 40 rear after further testing. Better handling and longevity, apparently.
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Current: CB500 Previous: CB100N, CB250RS, XJ900F, GT550, GPZ750R/1000RX, AJS M16, R100RT, Enfield Bullet

[i:6e3bfc7581]But still I fear and still I dare not laugh at the madman...[/i:6e3bfc7581]

[Simple]

[Irezumi aka Reuben]

I run my tyres according to the Haynes manual, always have done with my bikes, as has my Dad. 31 front and 36 rear I think that works out at. Must admit the front does feel a little vague, though Im on an old BT35 front.

Would have thought the chain would need a bit more attention than that as well personally. Know mine does.
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Pictorgraphicalfantastical

[Simple]

[Irezumi aka Reuben]

Mine get's lubed once a fortnight if it's lucky, the chain that is!
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Pictorgraphicalfantastical

[dodsi]

[stinkwheel]

[EuropeanNC30R...]

The main reason I don't buy a scottoiler is that the time I would save from not lubing the chain I would have to spend double telling everyone how great scottoilers are

[dodsi]

https://img.photobucket.com/albums/v171/dodsi2000/ZX6Rsilver-018.jpg

I never touch my chain and it allways stays clean...dont need to tell just show.

[Simple]

[Simple]

[sickpup]

[colin1]

simple, you may not be using full power acceleration, but i wouldnt describe you as a gentle rider

tyres wear from sharp cornering too, not just from whacking on the throttle
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colin1 is officially faster than god

[Simple]

I can't photgraph the wear on the front, can't get it to show up I'll post the pictures with the wear drawn on in paint.

The rear tyre is squared off, which is unavoidable when motorway mile munching.
the centre of the tyre is supposed to be harder (DC) than the outter yet the older bt45 has more tread on it which I replaced 5800miles ago



Colin - I'm not entirely sure how you can say what I ride like or even put a classification to my riding... considering I went to aberwotsit in your company but did not ride with you all day bar when in villages or when pootling, I imagine the only way you have brought about your classification of simple's riding is by hear say..
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Insta - FemFeral

[geordiecbrblo...]

Hmmm I know your bike is restricted but nearly 6000 miles is more than I'd expect (I have a jellymould CBR6 with BT45s)

Fronts do go 'saw-toothed' as per your pic, I believe it's caused by deceleration while cornering (mine looks exactly the same but still grips well )

I take my own wheels to the garage for new tyres - saves a few quid! I try and think of it as would I prefer:

1) The original Exedra tyres which last for years but don't grip
2) BT45s which grip better than most people realise but means they don't last forever - good tyres are cheaper than fairings / mashed bones etc

Hope this helps!

Safe riding,
Paul

[stinkwheel]

Stepping on the front tyre like that = Insufficient tyre pressure according to a mate of mine (who has been racing bikes for thirty odd years) when I showed him mine which had done exactly the same.

When I say insufficient, if you raise the tyre pressure it wont do that as much. You may find you get better grip with the lower pressure and decide you can live with replacing the tyres more often (which is the case with me).

The rear tyre looks squared off from lots of motorway/A-road use, low pressure or a combination of the two.

[dodsi]

How about you stop whining and replace the damn tyre?

5800 miles is fine from a tyre like that.

[iCraig]

BT45's are very soft commuter tyres, and you're likely to get anywhere from 5-8k from them.

I got about 7500 miles on my last set on a GS500, and I can say the bike wasn't ridden softly.

[Itchy]

funny everybody I ask keeps telling me BT45s are a very hard tyre compared to say BT90s which a girl had on her NC30
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[Phoenix]

They are, but BT45s are an entirely different fitment to BT090s, BT090s are proper sports tyres, like 207RR or similar. I'd be impressed if you managed to get a BT45 on the back of an NC30.