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Shimano Ultegra CS-HG800 11-Speed 11-34 Cassette

ShimanoUltegra CS-HG800 11-Speed 11-34 Cassette(Return to Product Page)

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(33 customer reviews)
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User submitted reviews

Review by PNW Biker

SRAM 11sp compatible
by PNW Biker
Competitive Racer
Pacific NW

Sweet spot gearing for PNW Cyclocross (SRAM 11x32 is too high for hilly CX courses, and the 11x36 is too low for flat courses, but Shimano's 11x34 is just right). Fully companiable with SRAM Force1 1x11sp.

Make sure you use the supplied freehub spacer.

Reviewed 11/6/2023
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Review by Anonymous

Solid choice for the money
by Anonymous
Competitive Racer
Golden, Colorado
2 of 2 customers found this review helpful.

Crisp, clean shifting cassette for those who don't feel like spending the extra cash for the Dura Ace. The larger 34 tooth gearing works perfectly in the Colorado mountains or on the steep gravel roads.

Reviewed 2/17/2023
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Review by Anonymous

What's not to like?
by Anonymous
Cycling Enthusiast
Mid-Atlantic
1 of 1 customers found this review helpful.

I've been using Ultegra cassettes ever since I broke two Dura Ace cassettes. They are quiet, shift great, and if you replace your chain when needed these cassettes last for well over 10,000 miles. The only reason I just bought a new one is that I'm looking for slightly lower gears for climbing as my girlfriend is the "Fastest girl in the world" and I'm trying to keep up with her on long steep climbs.

Reviewed 10/17/2023
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Review by Rainman737

Replaced an Ultegra 11-28
by Rainman737
Cycling Enthusiast
Camarillo, CA
1 of 1 customers found this review helpful.

Very high quality and great having the extra low gears for climbing. Be sure your derailleur can handle the larger cassette or buy a wolf tooth extension. You will also need a new chain. Very pleased with this purchase.

Reviewed 6/23/2023
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Review by AAcyclist

Solid smooth shifting
by AAcyclist
Cycling Enthusiast
Ann Arbor, MI
1 of 1 customers found this review helpful.

A rock solid, well made product. Shifts are smooth and quiet.

Reviewed 10/10/2023
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Review by BERoss

The cassette works great
by BERoss
Cycling Enthusiast
Annapolis, MD

The cassette was delivered without any issues. I gotten installed for an upcoming event that required some climbing elevation. I wanted to be ready. The cassette works great.

Reviewed 10/13/2023
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Review by BigMac1957

Works well with my 11 speed dura-ace derailleur
by BigMac1957
Cycling Enthusiast
Las Vegas, NV
2 of 2 customers found this review helpful.

I bought this to use when I do long very steep climbs in place of my usual 11-30 cassette. Its nice to have 2 easier gears on those climbs.

Reviewed 10/28/2022
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Review by Dave

Great climbing cassette
by Dave
S. C.

As alaways you get what you pay for, it's pricey but worth it for the quality and smooth shifting.

Reviewed 7/28/2023
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Review by rnfpdx

Great for gravel. Don't forget the spacer!
by rnfpdx
Cycling Enthusiast
Portland, OR
6 of 6 customers found this review helpful.

Replaced an 11-32 on my gravel bike. Nice to have the extra teeth for a little more relief when the going gets steep. NOTE that even though this is branded as an Ultegra cassette, it is actually spec'd for mountain bikes. Meaning - if you're using a road hubset you need to install the included spacer on the freehub before you install the cassette.

Reviewed 11/4/2021
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Review by Andrew

Solid Shimano
by Andrew
FLA

Good enough for flat, great for steep climbs

Reviewed 1/13/2023
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Review by DutchTouch

Shimano Ultegra CS-HG800 11-Speed 11-34 Cassette
by DutchTouch

Great cassette

Reviewed 1/13/2023
Thank you for your feedback.

Review by Little pebble

Gateway cassette
by Little pebble
Cycling Enthusiast
Carlton, Oregon

11-34 ultegra cassette is what allows this older cyclist to climb�5000 miles on my current ultegra

Reviewed 10/21/2022
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Review by Anonymous

Needed that extra cog
by Anonymous
Cycling Enthusiast

There are steep hills in the Islands , so I opted for this cassette... Im not too thrilled with the spacing of the gears, but it performs as well as can be expected..

Reviewed 12/6/2020
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Review by J brown

Gravel Cassette
by J brown
Idaho
1 of 2 customers found this review helpful.

Used this on a second set of wheels, GRX components, worked flawlessly.

Reviewed 1/31/2020
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Review by Anonymous

Works
by Anonymous

No issues so far.

Reviewed 2/25/2022
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Review by tiopablito

Shimano dropped the ball on this one
by tiopablito
Cycling Enthusiast
Georgia
4 of 9 customers found this review helpful.

Largest spider is bad design. Third from largest cog is too close to second from largest and fourth cog also is a little wonky. Several reviews I read before buying this warned me, but I reckoned Shimano would have corrected the problem. Nope (. Going back to the 105 cassette until their gravelCX groupset is available.

Reviewed 5/28/2019
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Review by Anonymous

Great cassette
by Anonymous
Cycling Enthusiast
LA

I'm glad they had this in stock. Ultegra cassettes make that pro noise!

Reviewed 11/11/2021
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Review by Anonymous

This is great! Allowed me to use my old Chris King wheels with an 11 speed drivetrain
by Anonymous
Cycling Enthusiast

With the advent of 11 speed road groups, I wanted to use my old 10 speed Chris King wheelset.

This let me use this wheelset for at least a few more years!

Reviewed 11/4/2021
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Review by Anonymous

The casssette for the rest of us
by Anonymous
Cycling Enthusiast
5 of 5 customers found this review helpful.

There is no shame in getting the gears that work FOR YOU! My setup Praxis Zayante 4832, Shimano Ultegra FD-6800, and Ultegra RD-6800-GS (long cage). The HG800 11-34 was a simple drop-in replacement for a CS-R8000 11-32. I tightened the B-Screw a 12 turn but it really wasn't that necessary. I did not even have to change the chain. The derailleurs have no problems shifting small-small to big-big and every combination in between.

Reviewed 3/25/2019
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Review by tfolkner

Low gears for steep hills
by tfolkner
Cycling Enthusiast
Cupertino, CA
17 of 17 customers found this review helpful.

I live near the Santa Cruz mountains in California and my bike club rides frequently up very steep hills (15-20% grades). I ride 10k miles with 1 million feet of climbing annually, but past racing age. I use this 11-34 gear with Ultegra 5034 cranks resulting in a 34-34 low gear. This lets you climb the steepest hills while spinning a decent RPM and not straining your knees. Also helps on long hard rides near the end to climb hills when you're tired. If you are a 125 lb racer you don't want this cassette. It's only drawback is that to achieve the wide range there are some gaps in the gearing. I miss the 12 tooth sprocket.

Reviewed 11/19/2018
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