Hubs
From Farkin Wiki
There are numerous different hub sizes and standards in use these days, this page attempts to explain the differences.
Contents |
[edit] Hub Clasifications
There are three main ways to fasten a hub to a frame or fork
[edit] Quick Release
Quick Release(Q/R) is the most common method in use because of the ease of which wheels can be removed from the frame/fork
[edit] Bolt Up
Bolt up hubs have a nut on each end of the axel which is tightend against the frame/fork bolt up is often used in Dirt jumping and light Freeride aplications because of the stiffnes increase.
[edit] Thru Axel
Thru Axels are hub where the axel is not part of the hub, the axel slides thru the hub and is usualy an integral part of the frame or fork. This allows frame and fork designers to use the axel as a structural member and increase rigidity in the frame/fork.
[edit] Forks
[edit] Standard
The original standard fork dropout is designed for a 9mm or 10mm axel (highly debated trivial difference) and is 100mm wide. the 100mm is measured from the faces of the hub that contact the inside faces of the dropouts. 9mm or 10mm forks can be fitted with Q/R, Bolt Up or Thru Axel hubs(in some cases).
[edit] The 20mm Standard
The primary diffference from the standard dropout is that the axel is a part of the fork assembely, this greatly improves the stiffness without adding weight. Most 20mm forks are disc specific.
[edit] 20mm Hubs
A 20mm Hub has a 20mm inner diamiter hole through the center of it it should be 110mm wide. All 20mm hubs are Thru Axel hubs.
[edit] Tool free 20mm Forks
Most fork manufacturers have developed Freeride and/or Dirt Jumping forks that use 20mm axels witch feature tool free wheel removal these systems are known as Maxel, Tulio, No-Tools Hex-Lock and QR20.
[edit] Rear Ends
[edit] 10mm Rear Ends
the standard rear end of a mountain bike is suited to a 10mm diamiter x 135mm wide hub. the 135mm is measured from the faces of the hub that contact the inside faces of the dropouts. Some rear ends on older bikes from the 5 - 7 speed era are only 130mm wide.
[edit] 12mm Rear Ends
12mm rear ends come in several widths, 135mm, 140mm and 145mm used in tandem and touring applications and 150mm and 165mm used in Freeride and Downhill Aplications.
[edit] Special Axels
[edit] Floating Bolt Up Axels
A Floating bolt up axel can be inserted into a Thru Axel hub so it can be attached to a frame in the same mannor as a bolt up axel would be.
[edit] Skraxels
From the words Skewer and Axel, a Scraxel is a big load bearing skewer that acts as an axel. Commonly used in a 9mm or 10mm front Thru Axel hub it serves as a midway soloution with most of the stiffnes benifits of a bolt up hub and the ease of removal of a Q/R
[edit] Step Downs and Slotted Axels
Step downs and slotted axels are both essenceialy a means to adapt a larger diameter Thru Axel to fit a frame with smaller dropouts. the most common is 12x135mm hub in a 10x135mm frame.
[edit] Shimano Saint
The Saint Axel doubles as an indstructable deraileur hanger when used with a saint deraileur. Alternativley it can be fastened useing a M10x1 (super fine) Nylock Nut
