![]() That means OPC shells are compatible with the entire history of BMX cranks, and everything else is just a temporary solution. 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. I’ve just ordered new redline 3 piece flight AL cranks + BB but I have no idea if the BB will fit.the BB is Sealed Euro BB with 6061 alloy cups included. 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. Of course this one will never take off because it's far too sensible.I get a ton of PM's and e mails on "what BB do I have" or will this kit work. So no fancy machining of BB shells, and plenty of room to go for larger beaings when we start using larger hollower axles. So picking a standard that will accomadate both is pretty tricky.Īnd all because no-one ever agreed on a standard for the original US bb.Īnd there's another one, the Yorkshire bb, which is basically some 16gauge tubing for a BB shell, and whatever sized bearings you decide to use with it come with plastic push in cups. There's also one that uses euro sealed bearings press fitted into the frame The problem with a lot of these is that the 2 main cranks people use have imperial bearings on one, and metric on the other. ![]() There's a Diamond Back one which is larger than a Euro and uses screw in cups, it may be the same as the Truvativ one though. How many BBs are there? Ok, there's an FBM one which uses regular profile bearings that push directly into the frame, there's a Spanish one that uses slightly smaller custom bearings that push directly into the frame.
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