Rear Tyre Question

[dungbug]

Evening gents, I need to change the rear tyre on the T'Cat. I'll have to go for a part worn for now as cash flow is a little 'interupted', I've found a tyre that's almost the same which is a Bridgestone Battlax 160 60 17 BT020 70W.
The marking on the existing tyre is 160 60 17 BT45 70W, my question is what does the 'BT' & 70W bit mean? Both tyres are tubeless types as well, the part worn is a good price considering the cost of a new tyre but I want to be sure it'll suit my bike before buying. As always, any advice would be greatly appreciated.

Thanks in advance.
____________________
CBT: Pass 25/06/2011 Theory Test: Pass12/06/2012 Mod 1: Fail 08/07/2012
Mod 1 Retest: Pass 15/0702012 Mod 2: Pass 03/08/2012
Suzuki GN125 (Sold) ~ Current bike: Yamaha YZF 600R Thundercat

[arry]

70W is the load and speed rating.

The BT bit, I'm fairly sure, is just Bridgestone's way of categorising a tyre - they do S for Sport, BT for Sports Touring and SC for scooters - or some such like that. Anyway, it's not of any particular importance, it's just Bridgestone that use the BT coding AFAIK.

[P.addy]

What tyres do you have currently?

I'm cheap and use race scrubs, £90 for a set of 2 supercorsas

[dungbug]

Cheers for the replies gents, I assumed as long as it was the same 160/60-17 size I'd be OK. The 'BT' meaning sports tourer would make sense as that's what the bike is classed as.

@ Paddy, I've got a Bridgestone Battlax on the rear & a Pirelli on the front (both came with the bike when I bought it).
____________________
CBT: Pass 25/06/2011 Theory Test: Pass12/06/2012 Mod 1: Fail 08/07/2012
Mod 1 Retest: Pass 15/0702012 Mod 2: Pass 03/08/2012
Suzuki GN125 (Sold) ~ Current bike: Yamaha YZF 600R Thundercat

[P.addy]

I'd match the Pirelli on the cat, they are great little handling things.

[dungbug]

[P.addy]

Well.. I had Michelin pilot power and I never saw a chicken strip on there.

[dungbug]