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I have a BMX with a Primo Pro crank on it that I need to remove.

The thread in the crank arms that the crank puller would normally screw into has 25mm diameter but I only seem to be able to find 22mm crank pullers.

Do crank pullers come in different sizes or is there some sort of adapted that I can use with a standard crank puller?

  • Just about every crank puller I've seen has threads for two different sizes of threads. Can't say what the common sizes are. – Daniel R Hicks Jan 20 at 13:32
  • If the puller has access to the rear side of the crank you may be able to use a standard claw type puller. de.wikipedia.org/wiki/Abzieher#/media/File:Poelietrekker.jpg – Carel Jan 20 at 18:26
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    Possible duplicate of this bicycles.stackexchange.com/questions/42415/… – Carel Jan 20 at 18:27
  • @Carel great spotting! – Criggie Jan 20 at 18:56
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    This question gets into the black hole of BMX crank puller intercompatibility and model specific designs that I glossed over (and also don't have all the answers for) in the other question. The way they're phrased make them look like the same question, but they're sort of not. – Nathan Knutson Jan 21 at 6:09
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I googled around and could find no mention of a Primo-specific puller or any 25mm puller. The threads are curious; most cranks like this don't have them. Maybe there used to be a tool available for them, or maybe a hop-up kit with threaded-in caps.

These cranks are more or less Profile copies and as such, in lieu of any other recommended procedure or tool available, the implication is you remove them by taking a Profile crank tool, removing the sleeve from it (which is used during installation), removing one of the crank bolts and replacing it with the tool, and pounding on the end of the tool with a hammer to drive the spindle out of the crank splines.

  • Yeah, I've searched pretty extensively and couldn't find a specific tool, although I did see mentioned that other size used to exist and was hopeful one of these might fit. Annoyingly, it seems the hit it with a hammer approach is the way forward, there's even tools that work this way - just seems a bit heavy handed. – Nick Holt Jan 22 at 13:50
  • @NickHolt It applies sharp side impacts to the bottom bracket bearings, which isn't ideal, but just kind of how it is with this type of crank. – Nathan Knutson Jan 22 at 21:26
  • Can you find a photo of the tool to add to answer? Not sure if eciimports.com/assets/thumb/25TOOLCRANKP.jpg or images-na.ssl-images-amazon.com/images/I/… or cdn.shopify.com/s/files/1/1540/1049/products/… (suspect middle one) – Criggie Jan 23 at 0:11
  • @Criggie the first video (ridebmx.com/how-to/use-bmx-crank-puller) in Deleted User's answer seems to sum up the BMX crank removers I've found - they're basically a big bolt, which you hit with hammer! – Nick Holt Jan 23 at 8:15
  • @NickHolt Video links may vanish - whereas a still image uploaded to StackExchange's part of Imgur will be around as long as SE is. – Criggie Jan 23 at 10:43

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