When it comes to Bajaj Avenger Street 160, the ideal tyre size is Front:-90/90-17 and Rear:- 130/90-15. However, upsizing the tyres is an option, but this may lead to some changes in the vehicle's performance. If you replace a part with a different spec, other related parts may also require replacement. A wider tyre may start brushing against the swingarm, leading to accelerated wear and tear compared to usual. This can also cause a decrease in performance, such as decreased fuel economy and top speed. Furthermore, a bigger contact patch with the surface leads to higher effort required to move the bike.