If they dont just come off or you cant rig something you will need to know whether they are Splined or not. There are two different types of pullers square and splined. If its a newer bike Im going to say it's splined and thats the type of puller you will need. I just bought a square puller for something like $12 bucks the other day. You might be able to get one with both on it for $20.
You can get an adapter which allows you to use a standard crank puller to get off shimano splined cranks.
It is a little steel spacer that VAR make that fits into the crank and presses against the splined axle.
I think they are about £5-00 in the UK.
You can take your cranks off by the single key release. I would only recomend doing this in an emergency type sitiation like when your buddy needed to tighten your pivot on the trail. If you use the single key release to often the threads on your crank can get damaged and then even a crank puller with the small splined bottom bracket adaptor would be useless.
rock, your on the right track
single key release and self extracting cranks bolts are the same. You can use it to remove cranks but what i am saying is dont make a practice out of it when you can use a crank puller.
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