Torsion bar

[limax2]

On a side note, It's nothing personal but, it's not really a torsion bar... Torsion/torque implies it's being twisted which it's not. It's being stretched so it's more of a stay bar. A common mistake but a mistake none the less 

Chris

It's nothing personal  , but it restrains the torque imposed on on the caliper carrier when the brake is applied. i.e. trying to twist the caliper and carrier round the wheel spindle.
Strange that in a parts list I have it is called a compression bar!

To get back to the main topic, the bar is 240mm between hole centres. I have an alluminium one on my bike that is the same length but not sure which Yamaha model it came from.