Do they go up hills, i fancy a trike

not sure how practical they would be around here. Does anyone use one in such terrain, would be interesting to know what they thought.
Bottom gear on trikes tend to be in the range 12-15" and being on three wheels means that there are no balance problems.
This means that in the dry, you can climb anything, just don't expect to be super speedy.
25% hills I climb at around 2.5 mph on my unloaded trike.
Load it up with trailer + camping gear and the speed can drop to only 1.5 mph.
If its wet then it depends on the road surface.
Being on three wheels means that there is less weight on the back wheel so you loose traction and wheel spin a lot easier than an upwrong.
If the road is very smooth or greasy then you can start to get wheel slippage at around 15%.
On tour with my full camping load I've finally found a couple a couple of hills I could not get up as the back wheel was just slipping and I was getting no where, but they where both +20% hills.
Coming down hills is another story.
Down a 10% hill and I'll expect to top 40 mph.
+17% and its +50 mph ........
