Schoolboy 7 speed Q

Hello learned gentlemen
How do you remove/install a 7 speed block on a Suntour XC Pro hub.
Please
Big pictures are good for me..rather than big words
Cheers
Carl

I havnt seen one of these for ages, the smallest cogs threads onto cassette body, you will need 2 chain whips, one to secure the 6 cogs and one on smallest to remove IIRC, picture would help to be sure

Its defo not a freewheel ??

Cassette or freewheel..

Assume cassette
-Two chainwhips
bottom two cogs are connected and are screwed on
-Hold large cog to stop rotating with chainwhip one.
-Use chainwhip two to unscrew (counter clockwise) the bottom cogs.

Easy Peasy.

And by Easy Peasy,
I actually mean, if like mine.
No amount of WD40 soak, turning, arm breaking, hammering, in bike as second chainwhip would undo it after all these year with the bottom cogs getting constantly tightened while cycling.

Therefore, take axle out, place long 10mm allen key in non-driveside and unscrew freehub.

doesn't help getting the cogs off (yet) but may allow you to use a vice, better soak it, or like me take the rim off and do a hub swap to a good shimano one with easy to use lockring.

Bum......why did I sell my extra chain-whip thinking I would never need two.
And double ar*e...that Ti cassette I bought from the States ain't gonna fit
Thanks fellas

Harryburgundy":22jf88m3 said:

Big pictures are good for me..rather than big words

Click to expand...

Class!



Er, pants.

Do I need an XC Pro specific cassette for mine then...?

Was presuming I would be able to use a standard one...

Are they difficult to source? Sorry for hijack HB...

Are they difficult to source? Sorry for hijack HB...

Click to expand...

No worries mate....need all the info. I can get, so keep this rolling

I might have a spare cassette for you if things go pear....rec'd some spares with the bike and I'm sure there was a cassette in there, but left the bag at a mates house.

Yes you'll need a specific cassette (assuming cassette still). They use a different spline pattern.

Also I think you need to know what speed you hub will take, the 8 speed are longer than the 7 speed etc.. Though I presume you can spacer it out, but you'll need to know which 'click' in the shifter you should be missing as the bottom cogs are wider apart than the top cogs.

All in all, Suntour freehubs are something you need to invest in rather than just get going.

Mine went down the pan (7 speed) when a tooth snapped of the top cog and the freehub began to wobble. Not getting the cassette of means I cannot fix it

Nothing on ebay at the moment, only one on ebay.com http://cgi.ebay.com/NOS-Suntour-PowerFl ... .m20.l1116
Not sure if you need a microdrive compatible freehub for the Microdrive cassette (the 11 tooth)

If it's not Microdrive then it will just be the bottom cog that is screwed on.

But don't go buying modern suntour cassettes


If you're a freewheel I think it's easier.




As a side note, this is the same method Shimano used for pre-Hyperglide (& hence lockring) cassettes.

Also note there is a APIII cassette that is Shimano spaced, which I think comes under the PowerFlo 'Rear' branding.

Freehub spline lengths
6 speed = 23.7mm
7 speed = 26.1mm
8 speed = 30.8mm

of course to help things :roll:
7 speed MD = 20.7mm
8 speed MD = 25.4mm

so you can double check what you have

Thanks FC...great help. I'll pop a picture of mine, but I can't get it off the hub (yet)