Originally Posted by
stapfam
Two types of 520's. The M520's are double sided and are normally seen on MTB's The A520's are a road pedal and clip only on one side.
Both use the shimano 2 bolt cleat and Can vouch for both. The A 520's take a bit of getting used to after double sided cleats- but have a longer "Platform" to support the shoe and foot so less chance of a Hot spot on the foot.
And as to servicing- Have used M520' for most bikes- the oldest being 8 years old and have gone from bike to bike. None of my pedals Have ever needed servicing or regreasing or ever caused a problem.
i think i'm going to go with the a520's. i called the local performance shop and they can special order them. $75.
the cheapest i found them online was $67. but with shipping, they end up being close to $75.