Inno test fit their roof rack part numbers # INXB123-2, # INXS250, and # INK163 on a 2008 Mazda RX-8 just like yours and they determined it fit well. While we haven't had the chance to test the fit we can guarantee it will fit your vehicle and work great!
I attached a link to this page for our return policy but you wouldn't need to worry. view full answer...
We do have a bike rack that will work with your daughter's 2004 Mazda.
I recommend the Hollywood Racks Over-The-Top Bike Carrier, part # HRF2. This bike rack is designed for vehicles that have a spoiler like the one on your daughter's RX-8. The high-rise frame extends up and over the spoiler and the carrier folds down for easy storage when not in use. This carrier has a weight capacity of 35 lbs per bike.
When carrying bikes with alternative frames like kids bikes or women's bikes I... view full answer...
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