Just saw Matt Jones video with 27.5” fork and 26” wheels. He lowered his 27.5” 100 fork to 90mm to drop his front end some. Said it’s nice. Dude, that's gonna make the bike flip end over
Front widths on mountain bikes are either 100 or 110. Cassette size, you need a hub (unless using a free wheel) that is spaced for the cassette you'll be using. There are 7, 8/9/10 and 11 speed free hubs. A 7 speed cassette will fit an 8 speed hub with a spacer. Cassette type, shimano and sram require a compatible hub, campy requires a Math says both jumps are 1.5 inches. you are doing your math on marketing numbers, not real numbers. There's a bigger difference between 27.5 and 29 than between 26 and 27.5. Yes but if you look percentage wise then 27,5 -> 29 is smaller jump. First of all that is not relevant here because it is a clearance issue.A 26 x 1.95 is only 25.5 inches in diameter, but a 26 x 2.4 is around 26.3 - 26.5 inches in diameter, essentially one inch higher, which makes a big difference rolling over stuff. Ride your 2.4's offroad; if you want to do easy offroad stuff/pavement, make sure to measure your fork arch clearance and back triangle before buying a new 29
While it may be possible to put 700c tyres on a 26 inch bike, professionals do not recommend it. The wheel size difference can affect the gravel bike’s handling, stability, and overall performance. Additionally, there may be compatibility clearance issues with the frame and calliper brakes. 700c tyres are a common size for road bikes, so it MlUGMZ.