BMX Frame Sizing
To be competitive proper sizing is important. BMX sizing is referred to by names and a top tube length. In addition to the frame size wheel sizes also vary. The Micro Mini and Mini sizes will have 20 x 1 1/8" tires, Junior and Expert models 20 x 1 3/8", and Pro series 20 x 1.75.
Rider Height | Rider Age (Avg.) | Rider Weight | Frame Size | Top Tube Length | Tire Size |
3' 8" & under | 5 & under | <60 lbs. | Micro Mini | < 18" | 18" |
3' 8" to 4' 6" | 5 to 7 | up to 75 lbs. | Mini | 18" | 1 1/8" |
4' 5" to 4' 10" | 8 to 10 | up to 110 lbs. | Junior | 18" to 18.5" | 1 3/8" |
4' 5" to 5' 2" | 10 to 13 | up to 130 lbs. | Expert | 19" to 19.5" | 1 3/8" |
4' 8" to 5' 5" | 10 to 13 | up to 150 lbs. | Expert XL | 19.5" to 20" | 1.5" |
5' 6" to 5' 10" | 13 & over | any | Pro | 20.5" to 21" | 1.75" |
5' 8" to 6' | 13 & over | any | Pro XL | 21" to 21.5" | 1.75" |
5' 10" + | 13 & over | any | Pro XXl | 21.5" + | 1.75" |
Cruisers | |||||
4' 5" to 4' 11" | 8 to 11 | up to 130 lbs. | Junior | 1 3/8" | |
4' 8" to 5' 7" | 10 to 13 | up to 160 lbs. | Expert | 1 3/8" | |
5' 5" + | any | any | Pro | 1.75" |