Praxis BB30 Bottom Bracket - Shimano Conversion
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Praxis BB30 Bottom Bracket - Shimano ConversionPraxis BB30 Bottom Bracket - Shimano Conversion
Code: PR-68-30
Praxis BB30 Bottom Bracket you have BB30, PF30 or a Specialized OSBB frame, but you need to run a different crank
No worries. Our Praxis Works Conversion BB is just what you're looking for. Made to fit in either BB30 or PF30 frame.


  • The converter works with either BB30 or PF30. 
  • To fit the converter to a BB30 frame, please remove the plastic sleeve (tube). 
  • To fit the converter to a PF30 frame, please fit the converter with the plastic sleeve (tube).
  • 68mm for Shimano Road Cranks
  • 73mm for Shimano MTB Cranks
  • Designed for Shimano™ 24mm Hollowtech II cranks. 
Praxis Bottom Bracket Converters are available for both 68 and 73mm shell sizes. 
Mr SayerFeels a nicely manufactured item, only time will tell the quality of the bearings. Really simple to fit with clear instructions provided and online videos available. Make sure you have use of two BB tools, one to hold the pressed in side while you tighten the screw in side. Removed a similar version for Shimano cranks and that came out easily too.
Kevinworked perfectly and is much better than the standard BB from shimano
Mr FlaskettDouble check the length required before ordering. Well engineered conversion BB, fairly straight forward to fit.
AndrewExcellent, very straightforward to fit and a real improvement on the press fit BB it replaced
Mr SmithEngineering that overcomes the inevitable’creaking travesty ‘ that comes with BB30 frames.
Mr gordonPraxis just make high quality. I used this to convert a specialized tarmac Pro 42mm bb to the gxp bb which is 24mm and 22 mm either side. The screw assembly made it easy to install non drive side first the screw in drive side perfect fit 20mins in total would definitely buy again
Mr TiainenAfter filing little bit of aluminium off the frame the bottom bracket fitted in easily and as promised. Installation was easy, but required special tools (bearing press and two! Shimano bottom bracket tools). Information about tools required was readily available beforehand and installation manual was easy to follow. The outer seals are loose and tend to drop off easily before installing crankset, which is the only minor complaint I have with this otherwise great product.
Mr SatoPrimera vez que cambio el BB30 con este adaptador,facil de instalar.
Mr LawThis BB has cured the creaking noise coming from my BB30 on my specialized roubaix, I was about the scrap the bike as several bike shops had failed to cure the problem ( sticking more grease in ) when I heard about this product, got a bike mechanic to fit it for me and now I have a quiet bike again !!!
Mr ValeraPerfectly fit to my Focus frame. Can now use a Shimano crank for my bb30 frame.
RichardNo squeaks, creaks and fully serviceable. Does what it is supposed to do. Don't forget the tools to insert and tighten it.
Mr NorthallThis is a brilliant upgrade to get away from the common creaking push fit bottom bracket, fitting this has now made my Synapse enjoyable to ride, I wished I had replaced it with a Praxis years ago. Really smooth and easy to fit
MarkWell made and simple to fit with some basic tools.
Mr ColeGreat product, quality feels good, fits really well. Make sure you follow the instructions for fitting - some good YouTube videos. Must be tightened until it stops which is a bit scary on a carbon frame but means it will work properly.
Mr ColcloughGreat bottom bracket, easy to fit and no creeks as of yet.
SteveThe bottom brackets are excellent! Perfect fit, long lasting and no creaking. You need to BB spanners to fit them. Fitted to my Super6 Evo with Shimano cranks.
WalFitted perfectly - changed over from Praxis cranks to Shimano. Praxis instructions very simple to follow, but when installing take your time.
JP rollerI’m using this on my allez sprint osbb and it’s a lot better than the BB30 bearing that came with the frameset. Praxis is also a reliable brand. Prevents creaking.
Mr RhodesFitted to my Cannondale Supersix which has a BB30 BB. I converted to hollowtech about 2 years ago using a Rotor unit which has already failed and started creaking so decided to go with the Praxis as a comparison. Hardest job to be honest was trying to remove the old Rotor unit! Once I had the Praxis went in no problem. I just followed the excellent online video. So far so good no creaking and runs nice and smoothly. 5 stars for the unit and Merlin for a super fast delivery.
Mr JonesThese bearings are perfect for the job, Converted my BB30 to GXP. Bearings are super smooth and fitting instructions were very clear.
Mr GarlapatiVery good bottom bracket. Would definitely recommend
AlastairSwapped over from praxis crankset to shimano ultegra on my specialized. What a difference, no more creaky bottom bracket for me and much to my club mates' joy!
Mr HenryExcelent product, easy fit/install and much better result that standard BB30 with adaptor cups for shimano cranks
Eats pizzaPut this in a Cannondale supersix to use Shimano 105 crankset. It looks and feels quality. Assembled it as per instructions and it went together perfect. No noise so far.
RobertPerfect fit. Smooth bearings, clear instructions.
AndrewGreat way to convert your BB30 bottom bracket to take a SRAM GXP crankset. After over 14k miles on the first praxis replacing like for like was a no brainier. Easy to install on my cannondale, creakfree and lasts ages.
RichNo longer restricted by crank type for PF30 frames. A proper conversion too - not an 'adapter'. Only minor downside is that you need 2 shimano type BB tools to install but a small price to pay for your crank to work properly. Done well over 10,000kms with my last one of these and had no problems.
M.Converted my PF30 BB to GXP crank. Bearings are smooth and installation was easy-ish.
MarkThis is now my 2nd BB kit in Bianchi in 4 years. A great replacement for the PF30. Easy to fit and no creaking!!!!
SeanBetter than the converter inserts. Less noise.
ReneyExcellent bottom bracket for conversion of PF30 shell to Shimano Hollowcrank II Cranks. Easy to fit
Michael GStops creaking, exceptionally well made. Highly recommended.
Mr poynterRead the reviews before purchase, wasn't disappointed either. Quality product
Mr RogersGreat product. The quality was as promised and the easy to fit and adjust. Made converting from BB30 to hollow tech a breeze.
Mr WilloughbyGreat product that's fits a BB30 and a PF30 frame. Well machined and designed to avoid creaks, but can be removed to re- grease or change. Unlike the Shimano bearing cups these do not have a plastic sleeve between the bearing and shaft, so make sure you preload them when installing the crank arm otherwise creaking may start...
Adam CheesemanAmazing piece of kit. Have a Specialized Carbon Frame with a PF30 BB Shell, and wanted to run some Shimano XT Cranks. Great quality product, and comes with clear instructions (PRAXIS even have a video on it on YouTube) - I installed it within 10 minutes and what can I say other than it does what it says on the tin, is very well made and worth the money over cheaper, plastic versions. After a lot of research I am glad I went for the Praxis! Thoroughly recommended!
TomExcellent convertor for BB30 to Shimano. They have updated the design though, so it is now slightly more complicated to install and does require a fair bit more effort. Also not sure how easy removal will be now, as a much tighter fit (although that should be a good thing I guess).
RobertSet up in a PF30 BB shell as per the instructions and works perfectly. No creaking noise and spins smoothly.
AndrewThis is the best solution for a BB30 bottom bracket conversion I have used. Well worth the price.
Mrs lagmayFits perfectly on Shimano Dura Ace
Mr SkyI bought the Praxis BB30 to shimano converter because the existing BB30 bearing had become loose in the frame and so there was play in the bottom bracket. I had feared I might need a new frame. I bought the Praxis BB on the recommendation of a bike mechanic I know. He fitted it and secured it in place with locktite. It's now running nice and smooth again. Apparently the bearings in the Praxis BB can be easily greased so should give me a few years of service.
Mr ATKINSA good quality component and easy to fit without special tools. Clear and accurate description by Merlin helped identify part needed a good job all round
WatkinsSuperbly engineered bit of kit. Really easy to fit - there's a good step-by-step video guide on the Praxis website. Quick service from Merlin's, and best price as always
Kieran BurnsI've owned several Praxis conversion kits since replacing my SRAM groupset with a 105 one and I've never been more grateful. I killed the last one through my own fault, so a word of warning is necessary: while it's not complex to fit, it IS exacting in its requirements. Follow the instructions carefully and do NOT grease the crankshaft to make it easier to fit. If you do as I say, you will have a silent and smooth BB that makes using Hollowtech II cranksets a breeze. I really can't fault it in use (4 stars because of the fitting, not the use)