Bikers and surfers have their own T-shirts, so why shouldn't motorcycle enthusiasts show what they feel best about?
If you want to enjoy the atmosphere or the experience after taking off your motorbike outfit or parking your bike, you can go for a quality T-shirt, with or without a logo. Because it is stylish, because they are easy to wear, because they are comfortable or just because you like it. Every reason is good, actually.
A T-shirt also makes a great gift. To give. Or to get.