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. 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. 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. 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). Looking back, big-bearing square-taper kits for OPC have also existed since the late 1970s. 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. 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. 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. Using the 6906 bearing in this manner solves the "bearings too small" issue of BB30 and PF30. The good news is that you can put those newfangled 30mm spindles on a 47mm shell using a 6906 bearing. The BMX Pro Euro Comeback happened about the same time as mountain bikes switched to BB30 and PF30. 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. 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. You can use any sealed American BB in a old school bike. 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. Redline and Eastern used this spindle mostly around 2000-2005 or so. I have never seen anything other than 19mm 8 spline cranks.ġ2 and 16 Spline was short lived. 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. Spanish is a super small Sealed bearing that is used in some NS Bikes. There is different size spindles but most are 19mm. A 19mm Mid bearing is the same bearing size used on a sealed American BB.Įuro is mostly used in Race frames built from the early 90s till present.Įasy to tell if it is Euro.Will have threads in the bottom Bracket shell. Most of the lower line bikes still use the standard American BB but most Mid Level-Pro Level use Mid. Most Bikes from 2000 up use Mid Bottom Bracket. There is also 20mm Very Rarely used.22mm used more on New School Bike. Most common size on the American BB Spindle is 19mm. Sealed Bearings have a sealed plastic cover and will have an Alloy Cup to install in the BB Shell. Unsealed is where you can see the ball bearings and has a stamped metal race that the bearings ride on. Most BMX Bikes built from 1978-2000 are American Bottom Bracket. Just putting this out there for those to see what will work. I get a ton of PM's and e mails on "what BB do I have" or will this kit work.
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