Tilting seats to lower head height

[braddo]

For people who have tilted their seats via risers/spacers under the front seat mounts, do you know roughly how much head height reduces compared to the height of the seat spacer?

For example, perhaps a 1-inch spacer would cause the head to move rearwards 2 inches and only 1/2 an inch downwards?

Maybe there's someone bored who can do a bit of trigonometry...

[Boggo]

moves it about 4 times the thickness back, and lowers a little.

My academy car runs no rear spacers and two thick ones in the front, I don't think you can get much more angle on it than that tho

[WB7]

I purchased GT seats from Oxted Trimming / Thundersport, to get more declined seats with better side support and comfy for long touring.
Best upgrade I ever did.

[pikeyboy]

I think I have 50 plus mm spacers from a karting suppliers at the front (which are chamfered to to the seat engle), with none at the rear. I do have the rigid seat rails thoough which add another ~20 mm height.

[V7SLR]

I have 30mm more spacers at the front than the rear, works perfectly.