Kawasaki Sportsbike Riders Club - Australia - Online Forum

OK, I want to change my tyres, because they're old, and they're getting hard, and I'm getting sick of them slipping all over the place when I least want it. Basically I don't trust 'em, so new tyres it is... what do y'all recommend, and where can I get 'em?

Also I want to change my rear sprocket so I can wheelie easier (at the moment I can only do it when I'm pissed off) and I need a really dumb explaination of what I need to ask for at the shop, and preferably the "why" explaination thrown in as well since I've been told a new rear sprocket will help but not really what it will do...

Cheers, thanks for help -J.

I had bt45's on my zzr. lots of grip, good on the track and they last for ages too, mine had done about 10000k's when I sold it and I reckon they had another 8000 - 10000 in em.
They get the big thumbs up from me.
I think theres also some michelin pilots that are meant to be good. Pilot City or something?

As for changing sprockets, what you're doing is changing the gearing. The front sprocket will rotate at a certain speed. The larger the rear sprocket the faster it will rotate for the same speed at the front therefore creating more torque.
It's a sacrifice though, your top speed will drop as you increase power down low.
I don't know how much point there is on a zzr 250 to tell you the truth. It will obviously wheelie easier, but not sure how much easier and you'll still need to clutch it up.

How much top speed would I lose? Just a rough idea would be good. I'm quite happy sitting at 160 or so, but I didn't think he had more more in him at those speeds... Be sad if my top speed dropped below 150, but I want to stunt the lil guy and more torque would help that -J.

altering the gearing wont matter a great deal if you only drop 1 or 2 teeth on the front sprocket. it will be noticible, but by rights you probably shouldn't reach more than 150 khp on the lil 2fiddy.
also, with the shorter gearing, it will have better punch out of corners. lower top speed, but you will get there quicker.
remember, removing 1 tooth on the front sprocket is equivalent to removing about 3 off the rear sprocket, so have a think about how much you need to drop. i.e if you only want to drop 2 teeth, you will drop 1 tooth off the front but have to add 1 onto the rear.
hope this helps, and that i didnt make it too confusing

removing 1 tooth on the front sprocket is equivalent to removing about 3 off the rear sprocket

This adding and taking away is getting you confused

Don't you mean removing one off the front is like 'adding' three to the front

See ya Sunday

this might help http://ninja250.kingston.net/speed.html
Set circumference to other and type in around 80 to give data for the zzr250. Stock sprockets are 14 front, 47 rear

I'm on Pirelli Sport Demon.

http://www.ksrc-au.com/phpBB2/viewtopic.php?t=2265

despite everyone recommending the bt45's? how do you find them? -J.

I've got BT45's on both hoops on my GPX 750 and am rather happy with the performance. I've always had bt45's on the rear, and recently replaced the macadam on the front with a bt45. The bike is a LOT more stable & confidence inspiring with a front bt45 compared to the macadams.

(as an example, im a rather conservative rider and my chicken strips have gone from about 12-13mm down to about 6mm rear AND front ).

seraph wrote:despite everyone recommending the bt45's? how do you find them? -J.

That is because no one had the Sport Demon before.
They are pretty good for my riding style, I've not regretted.

Thanks RG, I'll keep it in mind. Things change around here every few days, so I may not even bother with new tyres but we'll see. Where did you get yours done? -J.

I got them from Tyre for Bikes at Albion.

I just got a new rear tyre 2 mths ago due to a side-wall puncture.

If I remember correctly, the set(front + rear) cost me about $280.
It may cost abit more than 'The-cheapest-tyre-place-on-ths-planet', but I was very impressed with their customer service and they are closer to where I live.
When u have a side wall puncture, I don't think you'll have time to travel 30km to 'The-cheapest-tyre-place-on-this-planet' to save that few bucks.