Im currently looking at getting a new hardtail 29er frame, the geometry given on the website, is for when the bike is set up with 80mm forks.

I want to run it with 100mm forks but i dont no how much this changes things.

The headtube angle is 72d
The seatube angle is 73d
with a bb height of 11.8″

How much will 20mm effect the bikes and its ride?

Also on a completely different note, as the yeti bigtop comes with iscg 05 mounts,rear wheel option for 12mm,and a 1.5″ headtube. that you might get away with a bigger fork?

Thanks
MB

half a degree slacker, 10 mm higher bb approx

20 mm longer fork = 15 mm higher ride height after sag. 25 mm higher ride height = 1 degreee IIRC

Marginal difference

1 degree = 17mm fork length = additional length of your fork sagged (a-c being equal)

bb height would change 1/4″

Unlikely to make a huge difference. No idea re your last q.

Thanks gents.

I’ve done the maths so am confident my figures are “da bomb”

Geometry calculator here