Bike or BikerG 30

Even without a high bike skill and subsequently falling off a lot, I found the NRG challenge by far the easiest to complete due to the more compact location.

How to unlock the challenge
Once you have access to San Fierro, the second city in the game after you win the garage from Catalina, you can access this challenge at any time.

Where to find the challenge
Bring up the map and zoom in on your San Fierro garage save point. Now scroll the map a little to the east, and you'll see a diagonal dock just north of the airport runway. This is the dry dock. Drive / run here, and you'll find the dry dock itself - it looks like a huge bowl or half pipe in the concrete. You can't miss it! To the west end of the dry dock is a roof, underneath which stands a motorbike. Get on it, and the challenge begins!

How to complete the challenge
There are 18 red rings (corona) to drive through. Each one adds ten seconds to your time allowed to complete the challenge, and you must drive through them all to do so.

Start by driving around the perimeter of the dry dock, collecting the ones easily reachable at ground level, including the one on the loch at the opposite end from where you start.

Next, drop into the dock itself and again, collect the easy ones on the floor of the dock and the one slightly up one side.

Now comes the only tricky bit - the ones in the air! You must use the dock like a half pipe, accelerating up the walls to leap clear and hit the rings. The collision detection is very generous, thank goodness! Start by going length ways along the dock from the loch end, and drive up the centre of the end curve picking up the one in the covered roof. Now drop back in and do the same again, but this time veer left for one and then right for the other - two separate jumps - instead of going straight up the end wall.

Finally, collect the ones floating above the side walls using the same method, except you have a shorter run up because you're driving across the width of the dock.

TAKE YOUR TIME - it's far better to line up your run towards the Corona and hit it first time than it is to panic about the time limit and miss it repeatedly.

Finally, if you fail - you probably will the first time - and the bike doesn't respawn, you can park the NRG in the same place you found it, alight, get back on again and the challenge will restart.

Completing it will give you the achievement, a paltry some of cash, and increase your bike skill!