How much is down payment when buying Yamaha yzf-r15 Bike?

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Can I upsize tyres in Yamaha yzf-r15? Can I change tyres to bigger size in Yamaha yzf-r15? Does Yamaha yzf-r15 has alloy wheels? What is the size of the front and rear tyre of Yamaha yzf-r15 bike? Which is the best battery for Yamaha yzf-r15 bike? What are the problems with the Yamaha yzf-r15 bike? What is the solution for starting problem in Yamaha yzf-r15? What is engine capacity or cc or cubic capacity or displacement of Yamaha yzf-r15 Bike? What is the interest rate for Yamaha yzf-r15 Bike? What are the special schemes for government employees or teachers or doctors and corporate discounts for buying Yamaha yzf-r15 Bike? What are the accessories for Yamaha yzf-r15 Bike? What is the resale value of Yamaha yzf-r15 Bike? What is road tax of Yamaha yzf-r15 Bike? What is the price of the front and rear tyre of Yamaha yzf-r15 bike?