Reggie Bush -- Buys His & Hers Crotch Rockets

The couple that bikes together, stays together ... at least that's what Reggie Bush was banking on when he ponied up for two SICK motorcycles for himself and his bride right before their wedding.

TMZ Sports has learned ... the Detroit Lions star dropped $33,000 on two customized Yamaha bikes from Del Amo Motorsports in Redondo Beach.

We're told Bush hooked himself up with a Yamaha R1 ($18k) and his wife Lilit got a Yamaha R6 ($15k).

The difference between the two bikes? SPEED.

According to Yamaha's website, Reggie's R1 can hit up to 180 MPH ... Lilit's R6 tops out around 164 MPH.