I used B&Q Anchor Bolts for my 3 bike racks (from Halfords) on my garage wall. They are metal and use a nut to expand them in the wall. Even with a heavy recumbent and a tourer on one of them they haven't shifted a mm.
Easily found next to the Rawl plugs in B&Q and also on their website. Just make sure you get ones with long bolts otherwise they can be fiddly to get the rack on once they're in the wall.
Tim
Yay!Tim wins.
yeah, but he is fixing into thermalite, which in case you don't know, are as strong as a cream cracker biscuit - i.e. they are crumbly. Any method of fixing that relies on expading withing the block won't work as it will split the block. Anchor bolts work in concrete as concrete is much much stronger and not likely tii crimble.+1 for anchor bolts. I've used them for ground anchors and for fixing a pergola onto a concrete patio - they are properly solid.
yeah, but he is fixing into thermalite, which in case you don't know, are as strong as a cream cracker biscuit - i.e. they are crumbly.