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ShimanoUltegra CS-HG800 Cassette
Item # SHI00FY
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What do you think about this product?
January 20, 2020
Much needed upgrade
- I've used it once or twice and have initial impressions
I wanted to rebuild my wife's bike with premium components and this cassette was highly recommended by a friend. Installation was easy and now the bike feels much more suited for the steep grades in our area.
November 27, 2019
I have ultegra 6800 groupo, 11-28 cassette. With the proper cage and chain, will this cassette work?
March 28, 2020
My bike came with 11 speed long cage rear derailleur and 11-28 cassette. I had no problem replacing the 11-28 with this 11-34 cassette. I had to put in a longer chain though.
April 16, 2020
Yes it will, but you will need a long cage derailleur. I have exactly this set up, combined with a 50/34 chainring.
February 14, 2019
Great cassette nasty pitches
- I've put it through the wringer
Nice to have a cassette where it doesn't matter where I go there is a gear for pretty much any pitch I will face. Typical Shimano quality.
December 17, 2018
34T Cog Helps on Steep Climbs
- I've put it through the wringer
I ride in Colorado, which has steep hills at high altitude. There is cruel mountain road called Left Hand Canyon, which is 26 miles of relentless climbing that gets progressively steeper. The climb starts at 5,000 feet and tops-out at 9,000 feet. The last 3 miles is steeper than 12% grade. After the climb up Left Hand Canyon, I bought an 11-34T cassette. These two extra teeth on the big cog made a world of difference on steep climbs. I rode in the Triple ByPass ride, which is 120 miles over 3 mountain passes with 10,000 feet of vertical climbing. Those two extra teeth on the big cog made a real difference. I have included a shot of Loveland Pass, which is part of the Triple ByPass. Loveland pass tops out at 12,000 feet. Low gears really help. Even smaller hills seem flat with the 34T big cog. The only requirement is a long cage derailleur. My bike came with an Ultegra RD-8000 RD-GS that can handle a 11-34T Cassette. I didn't even have to change my chain. I recommend this cassette. Like all higher-end cassettes, this Ultegra cassette is light, durable and nicely finished. As mentioned before, on a road bike freehub you have to use the spacer that comes with the cassette.
May 16, 2018
Does this ultegra cassette fit on a 11speed road wheel free hub like all the other ultegra cassettes? I'm confused. I thought an 11 speed cassette doesn't need a spacer for a 11 speed free hub on a road bike wheel. If a spacer is needed does it come with the purchase of the cassette?
May 17, 2018
Yes, this cassette does include the spacer to adapt the freehub body to use this cassette.
August 29, 2018
It requires a spacer that is included. The large cog is dished so it can fit on disc brake mountain hubs that all still have 10 speed splines but dish out the larger cogs.
January 27, 2019
Stephen M, yes, this cassette is designed to work with a 1.8mm spacer on an 11 speed road cassette body.
April 24, 2018
This item allows us to use that nice 10 speed wheelset sitting in the corner because you bought a new bike with 11 speed. Shimano even thought of installation and tried to make it as easy as possible. The cassette comes packaged on a plastic alignment tool that slips on to your existing hub. Align the grooves and slide everything over to your hub all at once. Its literally that easy. I personally run this cassette on a SRAM Force 22 drivetrain with a med cage derailleur and 50/34 chain rings. It is super sweet and the 1:1 ratio made choosing a cadence while climbing so much better.
May 2, 2018
Hey Anthony, thanks for the review! Great feedback, much appreciated!
February 12, 2018
I have had two of these cassettes. Both were defective. There is a problem with the spacing between the third largest sprocket and the neighbouring sprockets. There is not quite enough room, and so the chain constantly catches. This is either a design flaw or manufacturing defect.
March 6, 2018
this sounds like an issue of not using the spacer with an 11speed freehub body... that would cause shifting issues
April 18, 2018
Tim, are you able to take any measurements? If this is a spacing issue between cog clusters then some shims might do the trick.
November 7, 2018
I have had the same issue with two of these cassettes as well - one used on an 11-speed road hub and one used on a MTB hub. The included spacers are used, or not used, as directed by Shimano. The issue is exactly the same as described by Tim: when the chain is on the third-largest cog, it catches briefly on the neighboring cog with every revolution of the cassette. A quick search of the world wide webz will reveal that others have had the same issue. The cassettes are defective. That said, it is an annoyance, but does not cause the chain to skip or prevent it from shifting properly, at least in my case.
February 7, 2019
I just got this cassette, and have this same issue. In 3rd largest cog, there is a clicking/popping sound every revolution. I took a video that shows the sound here https://youtu.be/YHHSqxqM49k I am going to try and return it and go with the 105 version of this cassette (CS-HG-700).
February 10, 2019
I am having the same issue. Driving me crazy.
July 24, 2019
Hi Tim, I have this cassette as well and have tossed it onto two different wheelsets for two different bikes with zero issues (one is rim brake 11spd hub, one is disc brake 10spd hub). Thinking out loud, would changing to an 11 spd chain help to eliminate the issue? They are a bit thinner. I changed the chain on the 2x10spd bike when I installed this cassette. As I mentioned above, super smooth shifting. For reference, I am using SRAM Etap WiFli RD Mech, and an SRAM PC-1170 11spd chain on both bikes. Best of luck!
April 6, 2020
how do you know its not the chain? One misaligned pin could be the problem.
January 20, 2018
Where does the spacer go on my 11 spd road hub body? The diagram from shimano makes it seem as if it fits between the 11t and the lock ring. But I feel it needs to be the first thing on the cassette before the first cluster. any help?
January 21, 2018
Trust your instinct. Spacer is the First thing on the cassette hub body. The thing I’m Shimanos diagram between the 11t and the lock ring is the wave washer which, while removable, is usually attached to the lock ring.
February 22, 2018
Is this problem resolved? I'm thinking to buy this 11-34t to use with ultegra r8000 long cage. https://www.competitivecyclist.com/shimano-ultegra-rd-r8000-rear-derailleur Thanks! Paul