There is different size spindles but most are 19mm. Spanish is a super small Sealed bearing that is used in some NS Bikes. It was popular for a couple years 2010-2013 but most have went back to the Mid bearings because them seem to hold up for longer.Ģ4mm is a really new thing 2014 and is being used by a few companies.Ĩ Spline is the spline most commonly used on pinch bolt Cranks. I have never seen anything other than 19mm 8 spline cranks.ġ2 and 16 Spline was short lived. Redline and Eastern used this spindle mostly around 2000-2005 or so. Most of these are 20mm and a pain in the butt to find bearings for.Ĥ8 Spline is what most non pinch bolt cranks use. You can use any sealed American BB in a old school bike. What about my 2017/18 PK Ripper Super Elite that has a PF30 BB with a 30mm spindle? I cant find many replacements but hear that this is what the newest race frames are coming with? Hope this helps and if any one needs some more help just PM me or post up a Question. Right, BMX started out with Euro BB's on minis, a few elite pros, and a whole bunch of cheap Asian crap that had cotter type cranks. The BMX Pro Euro Comeback happened about the same time as mountain bikes switched to BB30 and PF30. The good news is that you can put those newfangled 30mm spindles on a 47mm shell using a 6906 bearing. Using the 6906 bearing in this manner solves the "bearings too small" issue of BB30 and PF30. OPC shell with 47mm spacers wins.Īnd that means OPC shells were the way to go all along, because 47mm bearing spacers have existed as long as sealed bearing kits for OPC existed. They were part of the original sealed bearing OPC conversions: The 6906 bearings that would up-convert your cranks and the 6005 bearings that were used to convert OPC have the same 47mm OD. I even have an early sealed-bearing OPC that's missing those same 47mm spacers because the seller forgot to take them out of his frame. Looking back, big-bearing square-taper kits for OPC have also existed since the late 1970s. That means OPC shells are compatible with the entire history of BMX cranks, and everything else is just a temporary solution.The 19 and 22mm measurements you keep referring to are diameters, not lengths (a 22mm wide bottom bracket would be absolutely tiny! about the width of one of your crank arms!).Įuro BB's have their own fun standard as far as sizing goes, and most will follow the typical 68/73mm shell size (read: they'll fit either 68 or 73mm wide bottom bracket shells), and be between 108mm and 133mm in spindle width (113mm is the most common size used in the industry). If I'm not mistaken, your NS uses a 68mm shell, which means you'll be able to use either a 68mm specific BB, or a 73mm BB (and just use five mm worth of spacers, as instructed by the BB's manual).Īs far as spindle length (that pesky second number) goes, it will depend upon your frame, rear hub, and crankset. If you go with a crankset that uses an external bearing BB (like a shimano, or Race Face), then you don't have to worry about it, as it's sort of one-size-fits-all. However, anything that uses an internal-bearing BB (any ISIS, square-taper, Octa-Link, or BMX style cranksets) will require you to pay attention to the spindle length.
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