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Shimano XT CS-M770 9 Speed Cassette

Item #: CS306B00
USD$44.99 SAVE 30% USD$63.99 msrp
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Shimano XT CS-M770 9 Speed Cassette


Shimano Deore XT M770 Cassette features "Pro Level" technology at an accessible price.  The alloy carrier keeps the weight down and varying tooth profiles provide smooth shifting.  One unique feature on XT, pins behind the largest cog, help prevent the chain from damaging spokes.
  • Weight(claimed): 297 g
  • Compatible with 9 speed drivetrains
  • Fits all Shimano and Shimano compatible 8/9sp cassette bodies
  • Spider arm design
  • Aluminum lock ring
  • 34t version uses a 5 arm spider
  • 32t version uses a 4 arm spider
4.6 / 5.0
102 Reviews
5 Stars
4 Stars
3 Stars
2 Stars
1 Stars
72
26
1
1
2
Your bike isn't dead
Just like any vital part of a transmission on a car, cassettes wear out. Luckily it won't cost you thousands to replace on your bike. Nothing breathes new life in to your bike like a new cassette (at least after 3 years and thousands of miles). I'm loyal to Shimano after a horrible experience with SRAM, everyone has their own opinion, but you just can't beat Shimano. It's the reliability, quality, value, and performance you'd expect from Deore XT. Don't buy a new bike, just fix your transmission. Bike feels like it shifted off the showroom floor 3 years ago, keeping in mind I replaced the chain along with it.

PROS: Precise Shifting, Lightweight, Enhances Pedaling Efficiency, Durable, Easy To Install
October 28, 2014
Location:
Gilbert/San Tan/Prescott
Top Quality
Upgraded from a 32 tooth rear cassette to 34, I run a single 34 on front. Very nice gear spread and pretty smooth as well. Firm precise shifting.

PROS: Precise Shifting, Easy To Install, Durable, Enhances Pedaling Efficiency
October 22, 2014
Location:
Marietta, GA
Old Reliable
I have been using Shimano XTR and XT cassettes for many years and in my opinion you can't beat XT's performance for the dollar. I think the XT line up is the best value in mountain cassettes if you ride Shimano drive trains.

PROS: Easy To Install, Precise Shifting, Durable, Lightweight, Enhances Pedaling Efficiency

CONS: None

BEST USES: Mountain Biking, Road Biking, Commuting
September 16, 2014
Location:
Collegeville, PA
.
.

PROS: Durable
April 14, 2015
Location:
.
Great cassette but needed work ? ?
Had Jenson install when purchased and immediately noticed a faint spoke sound. After a few rides i had thought i had a few loose spokes but every time i checked them i found nothing. As the sound grew louder i had finally found the problem, shimano had designed the big sprocket with pins integrated as to protect from "chain damage to spokes" but these little pins had hit all spokes slightly damaging them. The sprocket had to have the pins lightly ground down with a dremell to clearance the spokes. I would have given it 5 stars but due to the fact that i was replacing the same exact cassette with a new one and the old one did not have the pins and now i had to modify a new cassette, i knocked it to 3 stars. Had jenson caught this on install i would had just bought something else and saved myself some time and spoke damage. If u are thinking the freewheel hub had play it was replaced weeks earlier so that is not the culprit. BTW who has had a chain jump over the large sprocket on the cassette ? Every time my chain derails i am flying and my chain falls to the smallest cog!

PROS: Durable, Precise Shifting

CONS: Difficult To Install
November 13, 2013
Location:
loma linda
Replace your chains on time!
If you're maintaining your bike properly, you'll be replacing your chain roughly every year, perhaps more often depending on how much you ride.

Chains wear out, and they'll start wearing out your cassette if they're not replaced. Then when you finally do replace the chain, you'll find the new chain slips and shifts improperly on your old cassette, and now you have to replace that too.

Cassette itself is fantastic. Nice and shiny matte silver finish and a great sounding freewheel.
April 26, 2017
Great cassette
Great cassette and a great price. So far no issues shifting, replaced original cassette and chain.
August 9, 2017
Purchased
2 months ago
Good looking cassette very light and durable. Replacing a deore one
May 8, 2017
Purchased
6 months ago
Love this product
Easy to install and works great

PROS: Enhances Pedaling Efficiency, Precise Shifting, Easy To Install, Durable
October 18, 2016
Location:
Florida
XT
It's the best you can get. It's worth the few extra dollars to get this lighter cassette.

PROS: Durable, Precise Shifting, Easy To Install, Enhances Pedaling Efficiency, Lightweight

BEST USES: Mountain Biking, Road Biking
October 24, 2016
Location:
South Bay, Los Angeles, CA

Q & A

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Is this compatible with SRAM X-7 as replacement cog?
A shopper on Oct 13, 2017

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Free Shipping Offer

Get free Standard Shipping with your $50 purchase today! Just choose Standard Shipping during checkout.

Please note this offer is only available to physical shipping addresses in the 48 continental United States (no PO Boxes), and oversize charges still apply on some heavy/large items.