Stop wasting time with WD40 and Plus-Gas, these will not penetrate a tight thread. It always cracks me up when I see this nonsense trotted out.
Buy a quaity pedal spanner like this: http://www.dalescycles.com/components/com_virtuemart/shop_image/product/park_pw5_tool.jpg notice the strength of the area around the flats, designed to prevent the "jaws" from opening under leverage.
Work out which way to turn to unscrew. From beside the bike, you unscrew towards the back of the bike, i.e. clockwise on the left and anticlockwise on the right.
Stand the bike upright and set the spanner on the crank so that it is as near as possible parallel to the crank, with its head as close as possible to the centre of the BB. On the left side, this means the crank will be facing forwards horizontally with the pedal engaged with the flats on the pedal spindle and facing backwards close to horizontal.
Put your foot on the end of the spanner and apply pressure.
Marvel at how the right technique makes even difficult tasks easy and go and pour yourself a beer.
From the bottom or the top?Here is an excellent way to remember to turn the pedal spanner the right way - on both sides, the spanner must turn towards the rear wheel. If it tight, a few taps on the spanner with a rubber mallet does the job.
From the bottom or the top?
If your still struggling when your tool arrives give me a pm...
All failing... I know a man!
I would try one of these, self adjusting pipe wrench, will grip even slippy surfaces and not too costly. http://www.ebay.co.uk/itm/2-PC-SELF...831?pt=LH_DefaultDomain_3&hash=item4adc76df47
I would try one of these, self adjusting pipe wrench, will grip even slippy surfaces and not too costly. http://www.ebay.co.uk/itm/2-PC-SELF...831?pt=LH_DefaultDomain_3&hash=item4adc76df47
Not "bad advice" just a suggestion, I have a pair of those wrenches and have used them on a few occasions when a nut has been rounded off, they work as a last resort much the same as vice grips with the exception the wrenches grip tighter as you turn them.Bad advice. That tool won't fit the narrow flats on the pedal spindle and it will chew up the finish on the surface. The pedal spanner is thin but strong for a reason. Spend the money and get a tool you'll be able to use for life.
Here; I went and took a couple of pics of how to do it. Firstly with a hex key in the end of the pedal spindle - hand flat on the tool pushing down but well clear of the chainring:
NB: this is tightening as I'm turning towards the front of the bike!
The point of pressure is almost adjacent to the BB centre so the effort becomes "out and back" leverage and is self-cancelling. If hand pressure isn't enough a smart tap with a mallet will shock it free.
Then with a traditional pedal spanner, again the "out and back" lever arrangement:
Again, you can put considerable pressure on this and if hand pressure fails, actually straddle the bike, put a foot on it and bounce. This is loosening as I'm turning towards the back of the bike.
Never fails.
From the bottom or the top?