Dan,
Having carried push irons in the past ( in my youthful racing days) there are a couple of problems ***ociated with carrying on the roof.
Drag tends to be greater, especially motorway speeds.
you sometimes tend to forget they are on the roof and then say pop in the supermarket on your way home, this tends to create problems with height restriction barriers on the car park and results in bikes resting in a different location and possibly a dent in your roof!
Depending on the weight of the bikes it can be a risky business to your paintwork getting them up there, especially with the front wheel out.
in Respect of a boot carrier.
you have to make sure the rack is fitted tightly ( not really a problem)
you need bungees to hold the bikes on ( you either love or hate bungees!)
You need to ensure that the number plate is visible, otherwise get another plate for the rack.
There is still drag and at speed you can see the bikes moving
One plus point of the boot carrier, people tend to hang back from you a bit more
Hope it helps
Hi Dan
I think I can help you with this one
I too am a cyclist. I got soooooo fed up dismantling muddy bike & putting in boot that I decided I needed a proper bike carrier. To fit a towbar was going to cost me about £300, plus i'd then have to buy the towbar carrier...another £300 ish quid. As I have reverse parking sensors on my car, that wasn't an option as I could get a decent detachable towhook that wasn't going to require a huge chunk being cut out of the rear bumper and lower skirt!!
I therefore purchased a set of THULE aerobars and 2x THULE 561 cycle carriers. My carrier stays clamped to the roof all the time (unless i'm doing a real long run and i'm not taking the bike. Ok so the downsides are:
1. Increased wind noise
2. I lose about 4mpg combined (but you can lose that with yr aircon on!
3. You have to be VERY careful when carrying bikes for height restrictions!!!!!
The downside of towbar racks is that if some idiot rear ends you, rack, bikes etc will get written off too!!! My riding mate had that happen a few yrs ago and had £4k worth of bikes wrecked!!!!
I do have a couple of helpful hints 4u which I hope will help:
1. I'm ***uming that your car doesn't have roof rails. Do not by the genuine HONDA roof bars as their max loads weight is less than the THULE ones!!!
2. When fitting the foot packs that clamp to the door frame, find out where each foot is going to sit on hte roof and apply some of that paint protection film - TRUST ME ON THIS - IT WILL STOP YOUR PAINTWORK GETTING SCRATCHED!! It's also worth cutting up some old inner tube to cushion the metal clamps!!!!
3. If you end up getting the THULE aero bars & carriers (ROOFBOX Company is quite reasonably priced) make sure you get the one key locking system - worth the extra cash as you can lock roofrack to car, and bike carriers wil lock to roofbars!
4.When bike is locked into place on carrier, I STRONGLY ADVISE THAT YOU TETHER THE PEDAL ARM NEAREST TO THE FRAME CLAMP. THIS WILL HELP KEEP BIKE UPRIGHT SHOULD CLAMP FAIL & OPEN AS IT WILL FALL ONTO THE CAR. I speak from experience B)
ended up with dent in roof and trip to body shop!
I would always recommend roof carrier as it is the cheapest option
Hope this advice helps
SImon