Shifter doesn't reach bigger gears My gear shifters (c. 2000 Shimano XT) will not shift to the bigger cogs (higher cable tension). Pushing the shift lever doesn't move the indicator past about half way so I can't reach the big cog on the front, or the lower gears at the back, it just doesn't click up into the next gear.

The bike is about 16 years old, so I'm guessing something in the shifters has worn out, but I thought I'd ask here in case there's something I missed and they're repairable!
I went to my local bike shop and they advised me to open up the shifters and give them a good spray inside with wd40, since it could be caused by the internals getting clogged up with dirt and grease.

This worked great and I can reach all the gears now, just need a little adjustment and then I'm good to go!

The bike shop was Ralph Colemans Cycles in Taunton, very helpful staff!