Author Topic: Time for tyres - and a lesson  (Read 5732 times)

Offline Bluey

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Time for tyres - and a lesson
« on: November 04, 2015, 10:31:25 AM »
A few Tuesday mornings ago, getting ready to ride. Check the tyres - front good, back appears to have no air. Not under pressure anyway. Bum!, or words to that effect. Couldn't see any cut greater than its neighbour and no evidence of anything embedded. Hmmm - shove some more air in, use water spray to look for leaks. Nuffink. No significant loss in one hour on centre stand. I reckon I can ride this to the tyre bloke. They are just about due to be replaced anyway. 16K km.

Get on the phone, talk to Bruce and Karen. Sure, they've got front and rear, In Pirelli Angel GT. Cool, I think, Pirelli are now making a tyre to suit (160/70 17 73W). Let's do it I say, I'll be there soon.

No dramas getting there. Tyres on, money paid. Rode away.

After 80 km, starting to feel good. I notice that the bike has more punch. Why, I ask myself. Bum! Again! It's a  160/60 17 on the rear, a lower profile tyre, therefore a smaller diameter. Like having more oomph on tap. I didn't know the tyre fitted was a non-standard size until this time.

Google. People do that, fit non-standard tyres, coz Honda, in one of their finer moments, decided to use an odd-ball tyre size on the CBS ABS/TCS ST. The Google wisdom appears to be that if an emergency alternative is needed, best it be 170/60 17 72W. It is closer in diameter to the 160/70 and has a higher weight rating, at 72W, than the 160/60 at 69W. I read that the extra width is not an issue. Still short in the weight rating though, but by much less. YRMV.

The weight rating. Therein lies the problem. In the words of the state gummint, if "Tyre load ratings are less than the minimum ... blah ... originally ... blah ... manufacturer", then it  is a reason for rejection when being examined for a safety certificate. It also has the potential to invalidate any insurance policies. The RACQ mention that. And other stuff too.

The next day, the tyre  was (very graciously, although with a $150 contribution from me) replaced with a Bridgestone T30 160/70 17 73W. Thank you very much Bruce and Karen.

Whose fault was it? Probably mine, but not solely. When I first rang, I may have said the size I wanted was 160/60, that is certainly what Karen wrote down in her notes, so that is what she heard. My notes show the correct size, 160/70. So did I say 60, not 70? I cannot see why I would, it isn't as if I was entertaining running that size. Hadn't entered my mind. Why would I have said it? A slip of the tongue? Dyslexia?

Is it possible to "mis-hear" somebody? A slip of the ear?

In the future, please question me if I ask for a non-standard tyre size!

All good now.
'99 ST1100
 
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Offline Diesel

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Re: Time for tyres - and a lesson
« Reply #1 on: November 04, 2015, 11:37:33 AM »
Great little anecdote there Bluey.

I've had the miscommunication a few times on other subjects, and been left feeling perplexed as to how they got THAT from THAT!      :H                       :rofl

You did well to pick that up whilst riding. You would have also found her wanting to lay down a lot easier when stationary as well, as the lower height makes the side stand geometry change in the favour of gravity.     :eek

Thanks for sharing.
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Offline spanner

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Re: Time for tyres - and a lesson
« Reply #2 on: November 04, 2015, 12:08:27 PM »
When I introduce myself to different people I say my name is DAVE.

Sometimes people will say straight back to me ..... and I mean immediately .... different names such a Michael, Peter and Brian being the most common .

I don't ever understand how people can get any of those names from Dave.       :fp :||||

I don't slur, I don't have a thick accent of any type, I am as aussie as you can get with a partial private education but don't have a plum in my mouth speech impediment.

People hear what they want to hear.

Its part of the 7 stages of communication.

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Offline alans1100

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Re: Time for tyres - and a lesson
« Reply #3 on: November 04, 2015, 12:12:01 PM »
I've had dealers fit 160/60 when they couldn't get a 160/70 rather than fit a 170/60. It hasn't caused me any drama in the past but the 160/60 isn't a size I'd choose. Currently running the T30 in OEM sizes and have used the 170/60 T30 GT spec tyre (previous set) before.
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Offline alans1100

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Re: Time for tyres - and a lesson
« Reply #4 on: November 04, 2015, 12:22:31 PM »
You would have also found her wanting to lay down a lot easier when stationary as well, as the lower height makes the side stand geometry change in the favour of gravity.
I think that might be the other way around.

With the lower overall height of the bike at the rear cause by a smaller rear tyre/wheel diameter would mean the side stand is a little closer to the ground reducing the lean angle compared to an OEM size tyre on the rear.

You might need more effort getting the bike on the centre stand though.
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Offline Diesel

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Re: Time for tyres - and a lesson
« Reply #5 on: November 04, 2015, 12:30:48 PM »

With the lower overall height of the bike at the rear cause by a smaller rear tyre/wheel diameter would mean the side stand is a little closer to the ground reducing the lean angle ...


This is precisely the problem - bike doesn't lean over far enough and can easily fall the other way on slight declinations.
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Offline alans1100

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Re: Time for tyres - and a lesson
« Reply #6 on: November 04, 2015, 01:12:55 PM »

This is precisely the problem - bike doesn't lean over far enough and can easily fall the other way on slight declinations.
Not something I considered when reading your previous comment.

Even with OEM rear I consider the lay of the ground when I park the bike.
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Offline Philbo

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Re: Time for tyres - and a lesson
« Reply #7 on: November 04, 2015, 05:39:14 PM »
To suit differing tyre profiles and land profiles, need to fit an adjustable length side stand, perhaps fashioned from one leg of a camera tripod.   :grin
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Offline Nigel

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Re: Time for tyres - and a lesson
« Reply #8 on: November 04, 2015, 07:44:04 PM »
Interesting topic, to say the least. I have read many times over many forums the virtues of sticking with the OEM sizes. First one being if there is an OFF no issues with an Insurance claim (in theory). Problem is I am about due for tyres for my 1100, done a little over 17K so ok with that? Like to go to the Pr4  but cant as they don't make them in 1100 sizes. So will probably stay with the Battlax 023 thats on it. They have been good but getting these sizes for the 1100 are getting more and more difficult. Any ideas for replacements in OEM sizes?...... :wht11
 
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Online Brock

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Re: Time for tyres - and a lesson
« Reply #9 on: November 04, 2015, 08:14:35 PM »
I have a PR4 GT 170/60 17 fitted to the rear and  PR4 GT 120/70 18 on the front. This is about as good as you will get on an 1100 these days, no one seems to make the OEM size any more as the demand is too low.

The speedo is very accurate ( under reads by 2 Ks), fuel economy hasnt changed.
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Online Williamson

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Re: Time for tyres - and a lesson
« Reply #10 on: November 04, 2015, 08:27:47 PM »
...... The speedo is very accurate ( under reads by 2 Ks), fuel economy hasn't changed.

How accurate were the speedo and odometer before, and now after?
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Offline alans1100

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Re: Time for tyres - and a lesson
« Reply #11 on: November 04, 2015, 08:33:36 PM »
Any ideas for replacements in OEM sizes?...... :wht11
The Bridgestone T30 supposed to be the replacement for the BT23.......ok for the 1100

The new Dunlop Roadsmart 11 also comes in 1100 OEM sizes....... sizes are in brochure http://www.dunloptyres.com.au/tyres/roadsmart2.dot

The 1300 rear shouldn't be an issue on the 1100A........the max weight rating is only 10 kg less than the OEM size and I doubt anyone loads their bike up to the limit.  Take into account also that the 1100 is 10 kg lighter than the 1100A so the 1300 rear probably suits the 1100 better.

Can someone with either a Police or 1100 model see what the tyre size says on the bike......my manual says only the 1100A needs the ZR rated tyre and maybe due to the 10kg extra weight. The other models are V rated.

« Last Edit: November 04, 2015, 08:53:50 PM by alans1100 »
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Re: Time for tyres - and a lesson
« Reply #12 on: November 04, 2015, 08:35:36 PM »
The speedo has always been accurate, (ex police bike - calibrated speedo) and I have always tried to get tyres as close as possible to police spec. changing the front tyre profiles affects the speed reading.
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Offline Nigel

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Re: Time for tyres - and a lesson
« Reply #13 on: November 04, 2015, 08:58:02 PM »
Any ideas for replacements in OEM sizes?...... :wht11
The Bridgestone T30 supposed to be the replacement for the BT23.......ok for the 1100

The new Dunlop Roadsmart 11 also comes in 1100 OEM sizes....... sizes are in brochure http://www.dunloptyres.com.au/tyres/roadsmart2.dot

The 1300 rear shouldn't be an issue on the 1100A........the max weight rating is only 10 kg less than the OEM size and I doubt anyone loads their bike up to the limit.  Take into account also that the 1100 is 10 kg lighter than the 1100A so the 1300 rear probably suits the 1100 better.

Can someone with either a Police or 1100 model see what the tyre size says on the bike......my manual says only the 1100A needs the ZR rated tyre and maybe due to the 10kg extra weight. The other models are V rated.


May look at those, they need to do a spellcheck on there site , really want to stay with OEM sizes though. All good............. :wht11
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Offline Philbo

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Re: Time for tyres - and a lesson
« Reply #14 on: November 05, 2015, 11:32:07 AM »
Mine is a 2004 ST1100P.  The manual for the ST1100 Police specifies front tyre 110/80 V18, and the rear 160/70 V17.  I have Bridgestone Battlax Sport Touring T30R tyres fitted.  110/80 ZR 18 m/c and 160/70 ZR 17 m/c.  The manual I have came with the bike which I bought through the police auctions in 2007. 
Phil :wht11
« Last Edit: November 05, 2015, 02:21:06 PM by Philbo »
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