KR1S tyres

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headcoats
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KR1S tyres

Post by headcoats » Tue Jul 03, 2018 2:49 pm

https://www.ebay.co.uk/itm/Motorradreif ... SwjkdZ6edU

Seems to be loads of options for KR1 tyres with the 130 rear (seen Avons £145 a pair) but are BT92's now defunct ?

Anyone seen these BT050 tyres ?
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Re: KR1S tyres

Post by headcoats » Tue Jul 03, 2018 3:03 pm

https://www.mandp.co.uk/bridgestone-bt0 ... 0hr18.html

Bridgstone UK offer no fitment

At M & P 140 60 18 isn't available only 150 60 18 :shock:

So what's going on ?

Have emailed Round and Black tyres as that was where I would get them from to ask what we can use now
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Re: KR1S tyres

Post by Garry » Wed Jul 04, 2018 6:21 am

As far as i am aware BT090 or stickier BT090 PRO are only road tyres available in UK -size 150/60 rear

They fit no problem

If you can wait (comes from Italy) this is best price on ebay

https://www.ebay.co.uk/itm/Motorcycle-T ... 1438.l2649
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Re: KR1S tyres

Post by headcoats » Wed Jul 04, 2018 8:30 am

Looks like BT92 are now NLA then ?

The 150 60 18 looks like a fitment for the NC39's etc so that may have saved us !

What do you make of the BT050 tyre ?
Is it a softer compound than the 90's as that is already a softer as in wear out quicker tyre ?
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Re: KR1S tyres

Post by Garry » Wed Jul 04, 2018 8:59 am

Not sure if the BT050 is still in production- dont think it was a sport tyre any way

BT92 is no more so BT090 is really your only choice for these rims

If your bike gets the amount of use mine do mileage doesn't really come in to it -plus tyres far exceed my riding ability :roll:
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Re: KR1S tyres

Post by headcoats » Wed Jul 04, 2018 9:08 am

Worrying though as Bridgestone have stopped making one of their two tyres and the other tyre manufacturers had ceased making their versions a good while a go

I will keep my Aprilia RS 250 rear wheels just in case but that would be a shame :cry:
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Re: KR1S tyres

Post by headcoats » Wed Jul 04, 2018 11:21 am

https://www.tyretectrading.co.uk/bridge ... -rear.html

It says on here that the BT050 replaces the BT92 tyre
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Re: KR1S tyres

Post by Garry » Wed Jul 04, 2018 2:01 pm

BT050 isn't listed in any size on the Bridgestone UK website - but you could try one

I think you will find most KR1S owners go for the BT090 -not sure about KR1 as it is a narrower rim

Choice is ultimately up to you
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Re: KR1S tyres

Post by headcoats » Wed Jul 04, 2018 2:15 pm

So still a bit of a mystery then these BT50's ?

It is encouraging though that Bridgestone have offered another option :P
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Re: KR1S tyres

Post by Virgie » Tue Jul 10, 2018 8:37 pm

I'm pretty sure I used to use the BT50 on my FZR600 and it was a standard road tyre so would be ok for high mileage wear. It was not a particularly grippy tyre more of a touring tyre. When the BT90 series came out they were a much softer and grippier compound trye and a great improvement over the BT50's. Everyone on the supersport 400 grid swapped to the BT90's. Hope that helps.
I got my KR out at Brands yesterday in the sizzling heat and had a grumpy first session where I had to pull in as the engine felt rough and would not rev out normally. We checked the plugs and she was running rich so we jetted down one size and normal power and crispness was restored. It was just so hot so I guess it shouldn't have been unexpected that the jetting would be affected. It was the first time I have ever had that problem in such an obvious way, I have rarely ever had to bother rejetting so it was a bit of a surprise!
An ex Team Green mechanic stopped by and told me lots of things they used to do to their KR's including running TZ cranks in them! He promised they used to get a good 75bhp no problem which if true is pretty amazing 8)

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Re: KR1S tyres

Post by dirk » Fri Jul 20, 2018 1:17 pm

by the way

Does one of you have the combination BT RS10 front and rear BT090pro tried?
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Re: KR1S tyres

Post by JanBros » Fri Jul 20, 2018 4:42 pm

haven't tried that combo, but have used about anything I had lying arround/available at the time and never had a bike doing "weird stuff". Even radial/diagonal combinations.
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Re: KR1S tyres

Post by Gonzo355 » Mon Aug 13, 2018 8:43 pm

Hi this is my advice to kr1 owners ,fit a 1s rear wheel as they are wider and go straight in ,then fit bt090.
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Re: KR1S tyres

Post by podman » Tue Aug 14, 2018 3:25 pm

Virgie wrote:
Tue Jul 10, 2018 8:37 pm
I'm pretty sure I used to use the BT50 on my FZR600 and it was a standard road tyre so would be ok for high mileage wear. It was not a particularly grippy tyre more of a touring tyre. When the BT90 series came out they were a much softer and grippier compound trye and a great improvement over the BT50's. Everyone on the supersport 400 grid swapped to the BT90's. Hope that helps.
I got my KR out at Brands yesterday in the sizzling heat and had a grumpy first session where I had to pull in as the engine felt rough and would not rev out normally. We checked the plugs and she was running rich so we jetted down one size and normal power and crispness was restored. It was just so hot so I guess it shouldn't have been unexpected that the jetting would be affected. It was the first time I have ever had that problem in such an obvious way, I have rarely ever had to bother rejetting so it was a bit of a surprise!
An ex Team Green mechanic stopped by and told me lots of things they used to do to their KR's including running TZ cranks in them! He promised they used to get a good 75bhp no problem which if true is pretty amazing 8)
Interesting piece around the ex Team Green bikes in Stan Stephens autobiography, he (says) tuned them for Team Green/Colin Wright and claimed he was getting around 65BHP , which seems a tad more realistic but either way im glad you had it running crisp for the day, im guessing you'll have to revert back to your original settings now its that bit cooler.

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Re: KR1S tyres

Post by geezagillard » Sat Oct 27, 2018 8:17 am

A quick look online for sticky 18 inch rears as follows:

Metzeler Racetec RR
160/60 ZR 18 M/C (70W) TL - K1
150/65 ZR 18 M/C (69W) TL - K1

Dunlop Alpha 14
R 140/60R18 64H 64H TL
R 150/60R18 67H 67H TL

Bridgestone BT090
150/60R18 M/C 67H TL

Any opinions for these or any options to add?

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