Splined vs 6 bolt... discuss

[plfrench]

I'm after some opinions, what are the pro's / con's of 6 bolt vs. splined disc mounting? I am looking at getting some 2009 Shimano XT discs and notice that both options are available.

Thanks,

Paul.

[.Adam.]

Does it not depend on yours hubs as to whether you need splined or bolted discs?

[plfrench]

Sorry I forgot to mention that I'm getting the relevant wheels at the same time! As you say it would be useful if the two parts fit together

My question really is regarding the pro's/ con's of the two systems of fixing before I decide which type to go for.

Thanks,

Paul.

[Beyond Rational]

Splined - more convenient changing of discs, can run adaptors to use certain 6 bolt discs. Lighter in theory and should provide a better interface with the hubs.

6 bolt - lots of bolts, no option at all to run splined. Not tied into a certain make of discs. Easier to remove on the trail with the usual carried tools.

Edited by Beyond Rational on Friday 24th April 12:20

[plfrench]

Thanks BR. Splined it is then. Hopefully it will be unlikely that I will need to remove on the trail, so all pro's seem in their favour.

Cheers,

Paul.

[a11y_m]

Only con with splined is you can't run Hope Hubs...

And IMO Hope hubs are the only hubs to have. I run a Shimano Alfine geared hub on one bike with a splined rotor mount and it's a great system compared to 6-bolt. Much quicker to change rotors, etc.

[pdV6]

Other than swapping rotors (which you do how often, exactly?) are there any other compelling technical reasons for running splined disc hubs?

[Beyond Rational]

pdV6 said:

Other than swapping rotors (which you do how often, exactly?) are there any other compelling technical reasons for running splined disc hubs?

I suspect greater surface area in contact between disc and hub, reducing the point loads you get with six bolts, the disc is also supported in line with rotation, not offset.

[JPJ]

Much as though I like Shimano kit and happy to use it for its longevity and the fact parts are readily available, splined hubs and rotors would not be my choice.

As someone pointed out above, how often do you change your rotors? The fact that most manufacturers support the 6 bolt system means you have a wider choice available to you, plus it also means you can fit new hubs as and when required (the part that will fall apart more quickly than a rotor).

I'm sure the loading they take is marginally better, but I've never, ever had an issue with the rotor/hub interface on a 6 bolt.

[mk1fan]

The 6-bolt adaptors for splined hubs are gash.

I don't think the splined system is lighter. IIRC, the brakeset is lighter but the hubs are heavier so, overall, it's heavier. That said, if you're that much of a weight weenie you'd be running a 140mm rotor on the rear and I don't think Shimano make a splined rotor in that size.

In summary then, there's no difference.

[Furberger]

Motorbikes use bolts and sustain significantly greater forces. Argument enough for me.

[hollowpockets]

6 bolts all the way, my hope bulb hubs have lasted 7 years with only one change of bearings (done as preventative maintenence)

I've only changed my discs once aswell so the arguement that it saves time changing them is worth nothing, I don't know anyone that rides with splined discs these days either.

[plfrench]

Just as well I checked back, as there seems to be more logic behind 6-bolt now! Merlin were out of stock of the rear XT splined hubs, so I was holding off. I'll crack on with 6-bolt instead.

Thanks guys,

Paul.

[R.P.M]

6 bolt all the way. More choice of hubs and discs.