I have a set of 20's 8.5front/9.5back staggered. What tire size would i need with a 1.5" drop?thanks

235 or 245/35 front, 265 or 275/30 rear

you could also go down to 30 series up front and 25 series in the rear

I know this sounds dumb but in 30 a large profile than 35? thanks

I know this sounds dumb but in 30 a large profile than 35? thanks

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30 refers to the sidewall size, which is measured as a ratio of sidewall height to tire width.

So, a 30-series sidewall for a 275mm tire is 82.5mm tall.

A 35-series sidewall for the same-size tire is 96.25mm tall.

To answer your question, the 35-series sidewall is "larger profile" than the 30-series one.

The 20" needs to be a 255/35R20 to keep the load capacity and the height of the tire the same as stock.

I run 245-35 in the front and 285-30 out back. No drop though, so I can't attest to rubbing/not rubbing.

Those sizes are fine as well but they are a little shorter.