Originally Posted by
apollored
SR Suntour XCM w/30mm stanchions, coil spring & preload, 100mm travel.
The wheels are 650b which makes it feel very high tho I think 26" wheels would make it very slow.
Someone asked me if it was a 29er, yeah wish I said lol.
Unless Trek is doing something funky in the UK that they aren't doing in the US, the wheels aren't 650b. The Trek 3900 listed on the website says the wheels are 26" (ISO 559mm rims). A 29er (ISO 622mm) would only be taller.
As for the fork, you could gain a little bit of standover by going to a shorter travel fork but it will steepen the headtube angle. An a road bike, you might be able to get away with a steeper angle but on a mountain bike used off-road, a steeper head angle makes the bike more difficult to handle. It gets real twitchy when you don't want twitchy.
It's probably best to cut your losses and go to a smaller frame.