I own a second had KB100(1995)RTZ its in a pristine condition, I have done 125000 kms till now , I have driven this bike from Lucknow to Allahabad , Lucknow to -Nanitaal-Bhimtaal-Kausani-haldawani-Almoda-Vally of flowers in a 4 day trip and belive me this bike is king of the hills, I have the rear tyre 100/90 fitted on this bike its performs like anything I cant mention in a short, its most reliable, I have also driven it through shallow river , and wont belive I have taken this bike to those place where only people can go by horses or trekking , this can perform best in off-road condition...i love this bike off-roading, maintenance is cheap , the thing which you have to take care is always go for genuine spares its better to have a new cylinder kit instead of gettin the cylinder bored and if possible have a new crankshaft each time you change its cylinder (The piston cylinder & crank shaft new will cost round about Rs 2400 only) try it its the best.Rest wut to say ride it and feel the difference.