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

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°

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...

Theory Crank Arm Pinch Bolts Sold as a pair  

The Theory Downtown 2 Bolt Railed Seatpost is an aluminum post that uses a two bolt design. Nothing overly fancy, just a workhorse looking to hold ...

Theory Elevate 29" Forks Someone had to eventually bring another decent option to the 29" wheel game, and Theory did just that. The Elevate Fork is...

Theory Elevate 29" Forks (With Disc Mount) Someone had to eventually bring another decent option to the 29" wheel game, and Theory did just that. T...

Theory Fork Compression Bolt M24

Theory Headset Spacer Kit Aluminum Kit includes 3 spacers: (1)2mm , (1)5mm, and (1)10mm Fits 1-1/8" steer tubes

6" x 2"

Theory Integrated Headset Sealed cartridge bearings 10mm dust cover

Theory Legacy Sprocket 

The Theory Median Pedals are a combination of thermoplastic bodies with removable steel pins. The removable pins are perfect for utilizing one side...