Theory

Theory 3 in 1 Hex Tool  Includes a 4,5 and 6mm allen key What you see is what you get

The Theory 3/8" Axle for SE Cassette will fit any single speed V-Brake bike like Big Rippers, Big Flyers, Blocks Flyer, etc. Shoulder to shoulder:...

The classic 410 chain has everything you need in a basic chain. 1/2"x1/8" 100 Links

Thicker side plates and riveted pins means the 510 chain can take some serious abuse. 1/2"x1/8" 100 Links

The Theory 8-Spline Spindles are a great replacement for any stock 8-spline spindle that may have unfortunately bit the dust. Theory has even taken...

Please note price is for cups only, if you need the full bottom bracket kit it can be found here.

The Theory American Bottom Bracket Kit includes two color matched american bottom bracket cups, matching colored cone spacers, two precision sealed...

Theory American Unsealed Bottom Bracket 24tpi Unsealed

Theory Axle Nuts Aluminum construction 17mm hex 26tpi

 Theory Bond Top Load Stem is made of cold forged 6061 aluminum with a 50mm reach. 

The Theory Bottom Bracket Spacers come in both 19mm and 22mm to work with most styles of BMX Crank spindles out on the market.Includes:(2) .6mm | (...

The Theory Brake Lever Barrel Adjusters come in all the sizes and all the colors.  Aluminum Sold as a pair

Theory Brake Pads Soft and grippy clear compound with black hardware 60mm long

The Theory brake rotor is a high quality steel rotor that is 160mm in diameter and 1.8mm thick.   

The Theory Bypass Bars are a 2-piece chromoly construction with a basic geometry that anyone can get used to. Width: 29.5" Upsweep: 2° Backsweep: 12°

Theory Cable Hanger Steel

The Theory Claw lever is a larger lever perfect for bikelife or other bigger bikes. Features a clamp with a flipable bolt so the lever can be run c...

Theory Cog (2.3mm Shimano Spec)  

The Theory Conserve Cranks are traditional 3 piece style made from a durable chromoly. The Conserve cranks use a 19mm 8 spline 135mm spindle. Great...

The Theory Conserve Cranks (Bike Life Version), are made from the same durable chromoly construction as the normal version, but instead come with a...

The Theory Conversion Headset turns a non integrated 1-1/8" headtube frame into an integrated one with this kit. This kit includes everything you n...

Theory Crank Arm Pinch Bolts Sold as a pair  

The Theory Data grips use a classic and comfortable mushroom style pattern. 150mm in length to work with today's wider bars.