First of all, post in proper english. xbhp is not a chatroom. Any further posts like this will be deleted and an infraction will be awarded to you.

Secondly, you will NOT get a performance gain with those garbage tyres. You want performance? Go back to the stock wheels.

no words for the poor R15

Need some experts to peep in here... need help with some calculations.

@Maxi, please excuse me for an outright negative comment on your bike. In fact, it does look good... pretty good. But then, the mods have definitely burdened the performance of the bike. After some people commenting here that you won't be able to even 120 KMPH and stuff, I thought "let the practical stuff be aside and let me see the theory part of it."

Would you please tell me the proper tyre sizes you have got? I mean, you didn't mention the profile size. I have however made an assumption that they are 70 profile and made the following calculation...



Need to see how far I am correct and if there is a better way to calculate things. But, so far, I don't see a major difference in the tyre circumference to either note a difference in the top speed (rear) or speedo reading (front)... but the weight of the tyre is enough to pull things down.

Also, please mention to us the changes to sprocket if any.

Hi, I also own an R15. my problem is with the radiator as it has started leaking after an accident. Can any one tell me how to get rid of it without getting it replaced??

@maxi: I wish you would have never done that. At least you should have think about bike's performance and engineering behind it's creation. Even with stock tyres, her looks are unmatchable. The balance and handling which stock tyres can provide, I'm afraid whether u r getting even half of it on those fat tyres???

man even a 120 would be a accaptable but 150 :O zomglol! revert back to old alloys and if u really want put 120 -130 max. and keep the final dia of wheel in chk coz that will decide ur topend!!

looks are most important to you i guess.. plz do correct me if im wrong..

one request don't screw d bike even more now....

Dude - if u want looks....better go for a higher end bike....do not screq up ur R-1-5.......

R-1-5 is not a bike of that we can do any performance upgrades.....it a perfect bike ---- where we cannot keep our hands on it ....it has to be in perfect stock condition ..... i would recomment u to go to stock tyres....'

Else its damn sure that ur engine is gonna get screwed up by another few thousand..ksss...

Sprocketing - upjetting - K&N ----- nothing will work.....

Upjetting..Main jets ??? What in the world !! First you (royally) screw your bike and you need comments and advice from ppl here to worsen it ??

You need performance ? CTRL+Z your bike..Sheesh..

Dude, Members have told you that R15 is just great! and not much modifiable. But, you want to keep the tyres still??

Well, What I suggest is get a ""Suitable"" Exhaust from a reputed company like TwoBrothers, KRP, etc.

Not any exhaust will do the purpose! It might even cut the FE/ performance... So, you must consult the stockist/ experts before you go in for such exhausts. It will increase sound & emissions.

If this doesn't work, I really have no idea what will, on the R15.