Bike Axle Standards

For decades quick release skewers were the standard for attaching wheels to a road bike.

Bike axle standards.

In bicycle nomenclature qr refers to a skewer and ta refers to a thru axle. Know your thru axle from your super boost spacing. Skewers are for the bbq. But this does build in constraints at both extremes of the.

Quick release thru axle. At first 135mm was the most common rear axle spacing with 150mm used for dh. How to measure a bicycle thru axle most thru axles are described by four measurements and you might see them described something like this. 15 x 100mm 127 length 1 5.

Front mtb thru axles currently use three standards. It looks as if the pace of change in disc bike axle standards will slow now with 12x100mm front and 12x142mm rear thru axles dominating. 15x100mm 15x110mm boost and 20x110mm the first number refers to the axle diameter while the second refers to the dropout width of the bike. The bike industry is known for not creating or adhering to standards but it wasn t until i needed a rear axle i realized how bad it had gotten.

Hub axle standards don t worry brands like boyd enve alto and others are still improving the performance of the humble rim brake hub. In this example 15mm is the diameter 100mm is the o l d 127mm is the overall length and 1 5mm is the thread pitch. Best mountain bike wheels. Our resident mechanic al explains axle standards.

If it is a thru axle it would have a ta in the description such as 110ta. As always there are some exceptions but we will focus on modern axle standards that are supported by pub wheels. Mountain bike axle standards explained. But 142mm and 157mm soon superseded these standards with the extra 7mm allowing a stiffer interface with the frame.