Well depending on what type of car you got, you could look at a rear receiver hitch/rack, either 1 1/4 or 2 inch rack can usually hold 2-4 bikes and either tilt/pivot down or swing away for rear trunk/hatch access.

IF your new car has a factory roof rack you can add brackets/adapters to mount your bike racks to the factory cross bars or add your own new cross bars to your racks.

You can also use the roof racks that attach to the door jambs, you will need to be a little more careful putting them on and off they they hold tight to the car.

I have used all of the above from Yakima starting in 1989 and have never had any complaints, although there are pluses and minuses to all of them.

to use the undercarriage, I blv you have to install a trailer hitch - not saying it's not doable, just pointing it out

To add the receiver hitch, it sounds like you will need to have it done for you, you can probably get it done at your local tire shop, maybe a muffler place, Walmart.

If you go roof rack, someplace like REI can and should help install it properly as well.

Getting a tow bar fitted (in the UK) costs about £180 (about $286 at current exchange rates - depending in the make and model of your vehicle). Popular cars (i.e. Focus' etc.) are normally the cheapest.

Makes matters much easier with 'ball mounted rack' rather than roof mount.

... However, if you are unfortunate enough to get hit up the backside whilst driving your car (with the bikes fitted), obviously your bikes will be no more. At least on your roof they stand a chance of surviving...

Until you drive into your garage before unloading...

Had a friend do that once. Resolved to go with the tail rack then!

... However, if you are unfortunate enough to get hit up the backside whilst driving your car (with the bikes fitted), obviously your bikes will be no more. At least on your roof they stand a chance of surviving...

Until you drive into your garage before unloading...

Had a friend do that once. Resolved to go with the tail rack then!

Friend drove his bikes into a tunnel -- insta-scrap heap and the roof of the car got pealed back.

Well depending on what type of car you got, you could look at a rear receiver hitch/rack, either 1 1/4 or 2 inch rack can usually hold 2-4 bikes and either tilt/pivot down or swing away for rear trunk/hatch access.

IF your new car has a factory roof rack you can add brackets/adapters to mount your bike racks to the factory cross bars or add your own new cross bars to your racks.

You can also use the roof racks that attach to the door jambs, you will need to be a little more careful putting them on and off they they hold tight to the car.

I have used all of the above from Yakima starting in 1989 and have never had any complaints, although there are pluses and minuses to all of them.

Yakima! They are the bomb, but the only way to assure no scratches is to have either factory roof top to connect to, or a receiver hitch. I have roof racks that strap on ... I choose to not remove them cause I know I will scratch things ... but I LOVE THEM.

I drive a Mazda 6 and installed a hitch (all by myself in about 30 minutes) and use a Yakima bike rack. It's awesome as I can open my trunk while the bike rack is on. Never had any problems. Nice thing is when I'm ready for a new car it all stays with me. Super easy, super safe, never had a problem in the 5+ yrs I've used it.

My husband has a Pontiac hatchback, though, and he cannot open the rear hatch when the rack is on. Just something to consider. We generally leave the bike rack on for about 10 months straight, so not being able to open the rear hatch would be a problem. We considered a roof rack but my 5'4" frame isn't tall enough for me to comfortable get things on and off the roof.

I use a step stool 5'4 1/2", I always wanted a roof rack, finally could afford one ... installed it ... went to put my bike on and couldn't get it up there ... grabbed the step stool from the kitchen ... problem solved. Love it!!!!

I've had a roof rack going well on 10 years+

One thing not mentioned thus far... you will see a drop in gas mileage with the rack on... even w/o bikes. With bikes, you'll see another drop.

I'm assuming the trailer hitch racks also experience some amount of gas mileage degradation when all the bikes are on, but I would suspect it's less than a fully loaded roof rack. Ex: I was experiencing 4-5 mpg less with a fully loaded roof rack over no rack.

Next vehicle, I'm likely going to go the hitch rack route... 1) I avoid the mistake of driving into the garage, 2) gas mileage improves, 3) soooo much easier to take it off and store in the garage as opposed to the roof rack - which I just go ahead and leave it on all the time.