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Hi, Swayndo and I just exchanged rotors (thanks bud) - my 6-bolt for his centerlock. I've never used centerlock before, I have 6-bolt adaptors on my wheels. I received 203mm rotors as agreed, but to my surprise their internal diameter is quite a bit bigger than my hubs centerlock splines diameter. I'm sure my hubs are "normal" because the 6-bolt adaptor fits.
Can anyone shed light on this? Are there 2 centerlock/splined diameters? 203mm so I'm guessing it's downhill-specific oversized-ness.
(We're swapping back - thanks again!)
Cheers, al.
IIRC shimano 20mm axled-front hubs need a bigger adaptor (for obvious reasons)?
A grown up will no doubt confirm shortly.
Are there 2 centerlock/splined diameters?
Yes. Saint hubs use an oversized centerlock spine. Think the 20mm XT & XTR hubs are different as well.
They have "SM-RT80" diameter 203 stamped on them.
Which, amongst others, [url= http://www.bike24.com/p24240.html ]brings up this result[/url]:
Original Shimano Deore Saint Oversize-Center Lock Disc. Deore Saint Discs in two sizes available: 160 and 203 mm.Oversize-Center Lock Disc not compatible with conventional Center lock or disc rotor mount (6 holes System)!
So, that's that then.
al.
Yep SM-RT80 are a Saint specific rotor, the diameter of the centrelock fitting is bigger. Current 20mm hubs such as XTR use a normal size centrelock spline but with a slightly different lock ring. The lock rings have notches on the outer edge so you use an external BB tool (TL-FC32) to tighten them instead of a cassette lock ring tool.
Shitmano strike again - more incompatible stuff to lock you into their systems.
OK.
Saint is larger, all the others are the same - 20mm included. Centrelock to 6 bolt adaptors work on all non-Saint hubs, including 20mm (you just use the lockring that comes with the 20mm hub).
So, you've got Saint ones but need standard. In my garage I have a selection in different sizes, gathered before I worked out what was going on!