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Mountain Bike Custom Gears & Parts : How to Install a Mountain Bike Gear Cassette

Mountain Bike Custom Gears & Parts : How to Install a Mountain Bike Gear Cassette


We’ve removed our rear cassette. You can see
because it’s in my hand. So, now I want you to take a look at the hub. So this bike’s
been ridden pretty hard, and you can see that there’s some dust and everything on the cassette
body. There’s also some indentations from where the cogs were digging in–that’s why
it’s a little bit more difficult for me to get it off. The first thing for me to do is
just take my rag and wipe everything off. Just inspect it, make sure it’s good. You
can see sort of what the ratchet mechanism does. As I move this back and forth you can
hear it click. And I also want you to notice that the spacing isn’t consistent between
all of these. For most of them there’s a small gap, and then right here you can see there’s
a larger gap, and that’s the only place on the entire cassette that we have that larger
gap. So that’s a keyway. That ensures that you put each cog on correctly. Because, as
you can see, each one of these cogs has it’s own keyway and everything like that, and on
most cassettes, it’s indicated by some sort of marking–where the large cog is. On this
specific cassette–this is from a company called Shram, it’s a model PG 970–the widest
cog is where the tooth number is written. So, what I’ll do is I’ll find that widest
keyway–I’ll find my widest array of cogs, and it’s as simple as pushing everything right
back on. Couldn’t be much more simple than that. Now I find the largest keyway on this
final 12-tooth cog, which as you can see is serrated to mesh up with the lock ring. And,
I place it on, make sure it’s seated, I stick my lock ring on, grab my special lock ring
tool, and torque it up by hand, and now I use my wrench on the lock ring to finally
torque everything up. And this is one of those things where there’s a proper torque specification,
and if you go too hard you’re going to break things, and if you don’t torque it enough,
your cassette’s going to come loose and rattle and really harm you?re shifting performance.
So, it’s marked here–that’s forty Newton meters, which basically means it’s not that
hard, but it’s a real firm sort of setup. So, now you’ve removed and reinstalled a cassette.
So, there you go.

11 comments on “Mountain Bike Custom Gears & Parts : How to Install a Mountain Bike Gear Cassette

  1. does anyone know what type of freewheel tool i should get for my sun race mfr30 cassette? it's lock ring has 4 notches. pls let me know… thanks

  2. i havew a question, my rear tire moves artound lots and its happened for awile is it the shaft holding the wheel on thats broken in half?

  3. You will need to check the hub body, and most likly you will need spacers to fill up the space of the cassette spider.

  4. @blaze591 As a professional mechanic and bike shop owner, his arm is perfectly calibrated to 40Nm. Torque wrench: gone.

  5. I have had this cassette on my bike. It was complete junk. I had a 11-23 gear ratio and the 23 tooth cog split right in half on me. The spacers in between the cogs are plastic on this cassette instead of metal like shimanos and it uses elen bolts instead of rivets which can loosen up over time. Stick with shimano cassettes.

  6. subscribe to the Bikeskills Channel on YouTube. Learn from the best. Subing automatically enters you to win FREE gear!

  7. @HITMANMONSTER i had the same question so i checked amazon… it said about $20-$30, so if u give it to a professional, i'm guessing bout $40-$50

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