Any good 80-90mm travel forks? My bike came with an 80mm travel fork. I haven't found any 80mm fork online; the lowest travel is 100mm. I asked the support team if I can install a 100mm fork in it and they said it would void the warranty since it's beyond the 10% allowable travel increase. I looked around and found out that going beyond the travel the bike came with would put strain in the head tube and change the bike's geometry.

That being said, are there any good 80mm travel forks out there that won't change the stack height, bb drop, and the head tube angle?

EDIT:
Following Klaster's answer, I found this neat little listing from rockshox. It lists the 30gold with 100mm travel as 473mm length and the sektor with 80mm as 474 length. According to the specialized page, my current fork length is 475mm (I assume this is the same is ATC). This means that either of those two won't change the geometry of the bike.
Yes, there are decent 27.5" 80mm forks. Generally, most of good forks allow to reduce travel, usually by a spacer in air spring.

For example:


Official product page of MRP Loop SL claims there's a 27.5" 80mm option available.
Manitou Machete has a 27.5" 100mm option with ability to adjust travel.
2013 RockShox SID service manual mentions travel adjustment in range from 80mm to 120mm for 27.5" model:



I'm sure there are more forks like that.