First things first, the Royal Enfield Bullet and Classic 350 are essentially the same bike in different colours with minor cosmetic differences, so whichever variant you choose of either bike, your riding experience is going to largely be the same. The Classic 350 Halcyon sits just above the base variant and comes with a rear drum brake, single-channel ABS, simpler components such as mirrors and rear brake pedal, and a halogen headlamp with pilot lights. The Bullet 350 standard black and black gold are the higher variants, which means they will have dual-channel ABS, a rear disc brake, chrome mirrors, and better finishing for the rear brake pedal, among other small cosmetic differences. These two variants are mechanically identical, with the primary difference being the paint scheme and the Black Gold’s black powder-coated finish compared to the Standard’s chrome finishing.
It is strongly recommended that you don't change tyre sizes to anything other than what the manufacturer recommends, as that will affect the bike's mileage, chassis balance, handling, and stability, among other things.
