you stretch the band over the back of the helmet
You can say "motocicleta" or "moto" for short. Remember that it is "la moto".
se rouler sur une moto
Moto goggles are single lens, ski goggles are double lens. The double lens reduces fogging, which is nice on the slopes and why ski goggles are more expensive. Also, good ski goggles come with UV protection, but some moto goggles do not.
The initials used for Bicycle Moto-Cross are BMX.
The cast of Moto-Cross - 1977 includes: Cleo Kretschmer Hubertus Martin
Bicycle Moto X, with X meaning Cross.
Bicycle Moto Cross
BMX
Bell helmets are very good, what I have worn for the last 30 years starting with the Moto 3 to my current Moto 7.
The Arai helmet is a top of the range motor sports helmet. It is worn in Moto GP, Motorcross and by over 50% of the formula 1 drivers on the circuit today.
Not sure which type of bike you are referring to. a standard bicycle = la bicicleta a motorcyle = la motorcicleta (or it can be shortened to moto which is more common in Spain)
BMX