MCS 41t BMX Chainring - Black - 110mm/130mm 5-bolt - USA Made 3.50 It is an adjustable bottom

It is an adjustable bottom bracket that allows you to adjust the spindle from side to side before locking into place to attain a more perfect chain line

Rear hub is a single speed cassette that works with Shimano type cogs (16t included) and 6-bolt disc brake rotor (not included)

Front Hub: Steel

These grips are MADE in the USA

MCS 41t BMX Chainring - Black - 110mm/130mm 5-bolt - USA Made 3.50 It is an adjustable bottomThe MCS 5 bolt chainring is an all American CNC machined product made of 6061 aluminum. It features an almost perfect round circumference, which will facilitate achieve an even tension of your chain. This chainring has a 110mm 130mm BCD, 5 bolt pattern and fits 3 32" chains. MCS chainrings are MADE IN THE USA! Size: 41tColor: Black