Jonnymac wrote:Gosling1 wrote:I can't see how that can align the wheels ? It just aligns the rear axle with the swingarm pivot - not the front wheel.
It might be old school - but string-lining a set of wheels is a piece of piss and really accurate. It works. And it doesn't cost $140 !!

That's right it's instead of using the lines on the blocks to align the rear wheel. And your right it doesn't align with the front wheel but if it's true in the swing arm then your nearly there.
well there has always been speculation on the accuracy of the marks on most swingarms over the years

so I can understand why this check would be a good one. What about the laser aligner ? This just sits on the rear sprocket and runs a laser light over the chain aimed at the front sprocket - this effectively aligns the rear axle to the chain run so the chain runs in a perfect straight line from the front sprocket......
redmistracer wrote:....So which is better or do they fix different things. I assumed having the axel line up with the swing arm would give your sprockets alingnment. Running strings will show if your bent somewhere (Forks, Triples/Headstem, Frame or Swingarm) or am I missing/thinking something else.....
well if you just want to check the chain run for maximum chain life - making sure the rear axle is perfectly aligned to the swingarm with the use of either that big aligning tool, or a laser aligner used off the rear sprocket - both of these will do this.
String-lining just makes sure the wheels are perfectly aligned - absolutely required if you want your bike to handle as well as it can. If the stringlining results in the chain run being misaligned - then you start looking for bent swingarms or maybe triple clamps etc. There are simple remedies and things you can do to check fork straightness / triple clamp alignment without removing forks from the frame.
First thing you need is 3 broomsticks !!
