I am planning on upgrading my old Pariot LT from 8 speed to 10 speed on the back. I know I can still use my existing Bulb hub, but do I need a 10 speed specific rear mech? I have a short cage on there at the moment with a Dual crank up front. Any help muchly appreciated.

Yes you do.

What he said.

What clubber said

what ndthornton said

What muppetWrangler said about what ndthornton said about what clubbed said.

I echo the above comments wholeheartedly. Opinions endorsed as fact.

Ahhh its so childish 🙂

On a serious note……

2 gears is a big jump!
Id recommend getting used to 9 speed first before attempting 10.

Thanks for your comments qtip and clubber, whatever they were.
Should I get a medium or a long cage rear mech then?

Should I get a medium or a long cage rear mech then?

Depends what you’re running up front. Long for a triple, medium for a double.

What he said 🙂

Though with the caveat that if you don’t run a wide range cassette and the chainrings aren’t too different on a double then you can use the short cage

I would be running a normal box standard SLX cassette, whatever that range is.

That could be 36-11, 34-11 or 32-11. Comes in three different sizes IIRC.

I went from 8 to 10 speed earlier this year. 10 speed with the clutch derailleur is fantastic!

What size could I get away with using a medium cage with a 36-11 cassette?

It’s not about the size of the chainrings, but the gap between them.

Others on here will be far more qualified to answer this than me, I tend to just go with what ‘feels right’ at the time.