When it comes to shopping for a new set of BMX cranks, it can be a little tricky deciding just what is right for you. Not only do BMX cranks come in multiple lengths, but they also come in three different spindle sizes; 19mm, 22mm and 24mm. Over the years, BMX has evolved and products have been refined over and over again to get to where they are these days. The quality has hit a level that has made it easy to trust that you’re going to be able to put your bike through some heavy riding and it’s going to withstand the abuse. At least this is true if you’re going with a reputable brand and not going with the cheapest option available. Now, there’s probably a lot of newer riders out there that are looking to upgrade their cranks on their bike. The question of “what size BMX cranks do I need?” has probably crossed your mind many times just looking at the options. So, we’ve put together a BMX crank size guide to help you figure out just what is right for you.
The main thing with crank length is the distance from one end to another. Some riders like really short cranks and some like the feeling of longer cranks. There isn’t really a huge difference, but there is enough to make a difference.
Crank arm length is more of a preference. Most riders these days run a 170mm or 175mm size, but you could go shorter or longer (Shorter is more ideal for street and flatland riding and longer is more ideal for jumping and racing). That 170mm – 175mm size is pretty ideal for street, park and dirt riding. The length is one of those things that come down to rider preference. We’ve seen a lot of riders swear by shorter cranks saying that it makes some tricks easier and give them foot clearance for their pegs. Then there are other riders that prefer theirs a little longer for more power when cranking or balance. Most cranks come in that 170mm to 175mm size since those are the most common sizes
160mm cranks are usually the shortest cranks available for a 20″ bike. They do not make it easier to pedal since there is less leverage. People ride 160mm cranks so pedals are closer to center and therefore are easier to catch when whipping.
This is a more popular size. 170mm cranks provide a good balance between leverage and control.
Just a small step up from 170mm. If you are not too picky. This is a good size for you.
Definitely the longest crank arm that I have seen. Usually, trail riders love this size so that they can get extra leverage and pedal easier.
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