SHIMANOCenterlock to 6-Bolt Rotor Adapter Black, One Size

I needed a new Centerlock adapter to replace an aluminum Bontrager model that I managed to wear out the threads after replacing probably my third rotor (I commute 20-40 miles a day). They did not strip due to cross threading, at least that I could tell, but just from too many removal/install cycles using a calibrated torque wrench (for the final torque step after hand threading). Before I hit the 40nM point, the resistance just went from slight to nothing. Removal saw little bits of thread come out. I was worried they were bits of the Shimano dynamo hub, but they were not magnetic and definitely felt aluminum.That preface out the way, the Shimano Centerlock adapter works fine. It comes with six bolts, with thread locker already applied, and ready to go. Installing it was a cinch using a torque wrench in the usual manner. The locknut portion was easy to start the install by hand, but you do need the appropriate adapter to complete the tightening. If I am wrong, I will correct it, but I am fairly certain I used a Park Tool BBT-49, now the 49.2 model  Park Tool Bottom Bracket Tool - BBT-49.2 Black, 39mm , bottom bracket tool along with a 3/8" torque wrench such as this Tekton, which I also use  TEKTON 24330 3/8-Inch Drive Click Torque Wrench (10-80 ft.-lb./13.6-108.5 Nm) .The big selling point is that it is steel, so I expect no issues with thread damage. If you need a new adapter, I highly recommend this one, a genuine Shimano piece. Park Tool Bottom Bracket Tool - BBT-49.2 Black, 39mmTEKTON 24330 3/8-Inch Drive Click Torque Wrench (10-80 ft.-lb./13.6-108.5 Nm)

Works perfectly.. highly reccomend

I don't know why centre lock adapters are so expensive, they are a tiny piece of metal, but it fit into my wheels perfectly.

As others have mentioned; this is a good adapter and needs to go on one way, even though it looks like it flips both ways.With this adapter, I went from using a 203mm Shimano (XT MT800, ice tech) up to a TRP 223mm rotor (the TRP 223mm 2.3mm thick rotor does not come in center lock). The MT800 is a fantastic rotor, but since I have been riding more trails with extended steep descents + 50lb e-bike, I needed an even more insane rotor.Out of the box install positioned the rotor and speed sensor in contact with the frame (see photos).I lapped/wet sanded and removed just a hair over 1mm of material from the 6-bolt adapter, sanding the side that contacts the rotor (see photo). This solved my problem (before and after photos)!Other than that this works awesome!

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