MikeOK

I知 still riding a 2003 Yeti with the same quick release skewers that every other bike used back then. Now I知 in the market for a new mtn bike and I知 confused with all the different variations. Could some of you gurus explain to me the different sizes, types, ones that are best and ones to avoid. Is there a standard I should look for? Thanks!

McBTC

For MTBs, the latest get is a through-axle 29'r, although... I've hard of battery/motor-assist offroad bikes that are tearing up the outback.

grubetown

grubetown

hig4s

For the rear standard thru axle size 12x142mm is boost is 12x148mm but rear axle size depends on the frame and there are some odd ones. Front thru axle standard is 15x100mm and boost is 15x110mm depending on fork, and again there are some odd ones out there.

If you don't plan on running any tires wider than 2.5in, standard is fine, if you want to go wider you will need boost.

I have an 2017 Evil Insurgent standard spacing front and rear (the 2018 frame is boost), and run 2.4in tires on my bike with 30mm rims and love it the way it is. My riding buddy has the same bike but opted for a boost fork, and he runs 2.5in rear and 2.6in front. I don't know how much suspension you are considering, or if you are interested in building your own bike, but evo.com has the 2017 Evil Insurgent frames for $1999 in M and L, and $1669 in XL.

JonathanGennick 

So called "boost" axle widths are where I believe the industry is heading, so I'd give a mild preference for those. Only a mild preference though, as the 15x100 mm and 12x142 mm sizes are widely used and very much still mainstream in my mind.