Originally Posted by
mstateglfr
Your fork was a tapered steerer 15mm thru axle with 45mm of rake, post mount brakes, and 395mm axle to crown.
The alloy versions had a QR fork, not a thru axle. The taper is also 1-1/4 to 1-1/8, which I understand is a little unusual. Definitely worth contacting GT to avoid potential fit problems.