they just have a bolt for the chaining on both sides.
For the spider you mean? Interesting!
BMX cranks don't have spiders
Bmx cranks w/ spider
You can use a volume Krull to get a spider if you have splined cranks
@B0N0R started
London Fixed Gear and Single-Speed is a community of predominantly fixed gear and single-speed cyclists in and around London, UK.
This site is supported almost exclusively by donations. Please consider donating a small amount regularly.
For the spider you mean? Interesting!