Game:

IndyCar Racing II (1995)

Duration: 0:00

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5

A basic intro/guide to GTREdit.

GUI Based ICR2 carset/track MIP map reduction tool

https://nirvtek.com/downloads/GTREdit.V1.0.1.7z
MD5: d1948d3806377437157531874302f09f

It should be fairly self-explanatory. An unzipped carset or track (with or without dat) is the source folder, the output folder is where the MIP reduced version goes, it's best if this is different to the final destination and it should be empty.
The number of MIP maps dropdown is used to select the maximum number of MIP maps to retain for each texture. If the texture has fewer it's left along, if not the smallest mip maps are removed.