What is the axle spacing?

Axle Spacing means the measurement between the centers of the axles as measured from center-to-center of wheel hubs.

How do you measure rear axle spacing?

The spacing of a frame/fork is measured from the inside surfaces of the dropouts, where they come into contact with the locknuts of the wheel’s axle.

How is rear frame spacing measured?

Frame spacing is the inside distance between the two fork ends (drop outs), where the wheel fits in. This can easily be measured just by removing the wheel and holding a ruler up to the space where the wheel came out.

What is the axle spacing on a semi?

In addition to Bridge Formula weight limits, Federal law states that single axles are limited to 20,000 pounds, and axles spaced more than 40 inches and not more than 96 inches apart (tandem axles) are limited to 34,000 pounds.

How is kingpin distance measured?

Kingpin to rear axle is measured from the kingpin to the center of the rear axle, if single, or to the center of a group of rear axles (23 CFR 658.19(h)(2)(i)(C))

What is a 12mm thru axle?

Example of how to measure Thru Axle specifications. From this specification we know 142mm is the hub width (or frame spacing) and 12mm is the diameter of the axle. We need to specify the following items to get the proper replacement Thru Axle. Total Thru Axle length from the seat to the end of the threads.

What is boost hub spacing?

As for the specifics, Boost has a front hub width of 110 x 15 mm and rear hub spacing of 148 x 12 mm that results in increased wheel strength on all wheel sizes as well as added design flexibility. Full Speed Ahead has definitely noticed significant improvements in wheel strength and stability in Boost wheelsets.

How are truck axles measured?

With the axle removed, which is the only true way to measure it, measuring from the inside end to the bearing seat, the outer flange, and from the outside flange to the bearing stop. Measuring the hub and flange diameter are just as important to make sure they’ll fit inside a brake rotor or drum.

How do you measure a trailer axle spread?

Most trailers weigh about the same, but they many use four-inch or six-inch holes in the slider. Rather than count the holes, measure the distance from the back of the trailer to the center of the rear axle hub.

What are the most common rear wheel spacings road and mountain in millimeters?

Most road, CX, and gravel bikes come with 12X100mm thru axle front and 12X142mm thru axle rear. Most mountain bikes come with 15X110mm thru axle front and 12X148mm thru axle rear. Very recently (starting around 2018ish), a few brands have wanted to go even wider with the rear wheel hub spec.

Will we ever get narrower than 135mm wheel spacing?

My money is on the industry sliming down to narrower than 135mm sometime over the next decade with marketing hyping the weight savings and mech clearance benefits. We can have tire clearance, and stiff wheels with narrower than 135mm spacing.

Do I need boost spacing on my thru axle?

For mid-range and higher spec XC, trail and enduro bikes, thru-axles with Boost spacing are now the norm. But you can still find lower-priced MTBs running on quick release hubs or non-Boost thru-axles.

Will super boost 157mm axles be standard on 2019 bikes?

We’re aware of the benefits of Super Boost 157, but also the possible downsides, including heel strikes and consumer fatigue regarding new standards. “With that in mind, we do not have plans to use the 157mm axle standard on any new bikes in 2019.

Are super boost and 157mm spacing the same thing?

Watch out for Super Boost creeping into larger brands’ bikes soon, though. 157mm spacing is also the standard for the rear wheel on downhill bikes. But the hub geometry is slightly different to Super Boost, with different brake rotor placement, so they’re not the same thing.