Shimano 105 5800 11 Speed Groupset Black
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RRP $645.64 Save 41%
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Code: GRP-5800B
Shimano's latest 105 groupset, the new 5800 series is now 11 speed with features from the Dura Ace and Ultegra Groupsets.

Shimano's 5800 groupset is the latest in the 105 series of road groupsets. It follows the Dura Ace 9000 and Ultegra 6800 groups in being 11 speed. With a choice of 3 chainset options 34/50, 36/52 and 39/53 together with the 11 speed cassette options there is a 5800 groupset to suit every cyclist.

Not all options have been released yet but as soon as they have we will add them to the groupset.

Groupset Contains:

Chainset: FC5800 Choice of 165, 170, 172.5 and 175mm crank lengths, 34/50, 36/52 and 39/53 chainrings. New 4 arm design, 1 design only allows you to interchange chainrings.

Bottom Bracket: BBR60, choice of English or Italian

Cassette: CS5800, choice of 12/25, 11/28 (use SS rear derailleur) or 11/32 (requires GS rear derailleur) 11 speed

Chain: CNHG600 105 11 speed

Rear Derailleur: RD5800 Choice of short cage SS model for use with 11/25 and 11/28 cassette or the GS model with a slighly longer cage for use with the wider ratio 11/32 cassette.

Front Derailleur: FD5800, choice of Braze-On, 31.8 and 34.9 band-on

Brakes: BR5800, new updated design to work with 28mm tyres if needed

STI Brake/Gear Levers: ST5800 Shimano's proven STI levers with concealed brake and gear cables.

Cables: Shimano brake and gear cables (inner and outer) supplied.

All products are aftermarket boxed, everything comes in its original Shimano box with instructions.





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First impressions. Removed stock Shimano Claris components from my 2014 Jamis Ventura Sport. Everything installed smoothly. I mistakenly ordered braze on front derailleur, so I acquired a strap on adapter. The weight off my bicycle was apperant. Shifters click with less pressure. Brakes are stronger and responsive. Extremely happy with my upgrade.
Upgraded my 5700 105 to this 5800 105. The difference is outstanding! The shifting is so crisp and direct and changing from the small ring to the big ring has never been easier. Can't believe the difference from a product with the same name. A1 groupset. AWESOME!!!
This groupset is AWESOME. The guys at MerlinCycles are the best and I will never make large road bike purchases without looking to them first.
Upgraded my wife's 10 year old Lightspeed with this groupset -- what a difference. Smooth shifting and braking, and all 22 gear combinations are available, due to Shimano's additional trim positions for the front derailleur. Highly recommended.
The latest 11-speed Shimano 105 groupset is a quantum leap forwards. This is the third one I have bought. Having initially refitted my wife's 1994 Cannondale R400 then building my son's latest road bike with 105 5800, I decided to upgrade my 1989 Raleigh Road Ace to use as a winter bike. The groupset rivals the performance of the Dura Ace 9000 I have on my best bike. Every aspect of it is feather light and precise. The brakes are powerful, progressive and so light to operate that my 13 year old son can safely ride on the hoods as well as the drops. The 4 positions and the way the trimming works on the front mech means one never drops the chain once it is set up correctly... and by carefully following the dealer documentation from the Shimano website, it is easy to set up the groupset really well. I can't fault this fantastic groupset.
Not bought a new groupset for quite a few years but Merlin were offering a great deal and I've shopped before and had great service. The groupset arrived next day! The description said all items were boxed - this was not the case, only the chainset and front mech were boxed, everything else was bagged. Everything was there as described so this not an issue for me. I am happy setting the individual components up but the front mech needs the full instructions off the shimano website as they are not provided in the box. Follow these instructions and it is easy to do and works perfectly from the off - no fiddling required. Like the rest of the reviews say, the groupset works really well and is so light on the upshifts you are in danger of pushing the levers too hard to change gear - refreshing change! The new brakes look a bit industrial but are fine. The shifters are ok but still a bit long in the body compared to SRAM and the exposed mechanicals look a bit cheap but these are the only 'criticisms'. Overall very impressed but it is all new stuff with one 100 mile ride on it but if I am saying this in 3 years time then it really would be a proper bargain. Its not ultegra or sram but can't see how it falls that far short in performance except in price.
This group just works. I've previously had Shimano 105 5700 and can honestly say this is definitely an upgrade. Once set up correctly, its never missed a shift. So good in fact I find it hard to distinguish the difference between it and Ultra 6800
Fantastic groupset. I upgraded from a 2006 9 speed shimano 105 triple with FSA gossamer crank. This shed nearly a half a pound of weight and shifts like butter.
Absolutely perfect! Love the ability to customise the gruppo to my own preference, and the price is below what my LBS pays wholesale. The upgrade from Sora to 105 is like getting a brand new bike! Smoother shifting, more solid feel to the lever action, everything just feels "tighter."
This groupset is amazing! The ergonomics of the new shifters allow for a better and less tensioned hand placement. The new front derailleur design pops the chain up to the big chain ring very fast and it feels very light when shifting at the lever. Brakes are solid, and the rear derailleur shifts well too. I would highly recommend getting this groupset. If something breaks, the replacement parts would be cheap to acquire.
Absolutely fantastic group. Smooth shifting, quality built. Not much different from ultegra. Highly recommended group.
Should have called this group 105 6800. Its pretty much last years Ultegra. smooth shifting, hollowtech crank arms. 4 arm spider on the chainset, etc... bought this and a new 11 speed compatible wheelset and dropped close to 2.5 lbs off my bike. Great purchase! def not the old 105!
Excellent product, made my bike like a brand new bike. The shifting is now effortless, and everything is very quiet and smooth. Best price on this groupset as well.
It is just amazing, I've put cca 500 km on in just under 4 days and it impressed me. Smooth shifting, and amazing brake power. Feels like a pro set for half price. And it also looks cool :D
Converted from 9 to 11 speed. The 11-speed 105 is an amazing deal on a truly refined groupo. Everything was perfectly packaged and included all accessories. Advice - When going to 11-speed, make sure your derailleur hanger is PERFECTLY straight or you will have problems. You might want to pick up an alignment tool for your home shop.
Tight shifting, no need to shift twice to move from low to high on a double, unlike older versions, great range.
105 are a great group set. My previous experiences are that they perform well but are far more durable than the more expensive group sets. As I don't compete but do ride lots of semi fast group rides I wouldn't choose anything else.
Purchased this groupset (along with new wheels) to replace the Ultegra 6700 on my training bike. After putting in a thousand miles, I have to tip my hat to Shimano (for the groupset's quality) and Merlin (for their pricing). Dialled in correctly, shifting is light and accurate. Superb value for money.
This 5800 groupset replaces my four year old 105 5700 which has now allowed me to make a winter bike. It shifts much better and has adjustable reach levers rather than the fixed plastic shims. Brakes have a better feel. Did have a problem with the left-hand lever rattling but was quickly replaced under warranty. Did consider Ultegra but this is very cheap and just as good for the money and usual excellent service from Merlin.
This 11 speed groupset replaced my Shimano 105 10 speed groupset. It shifts better, has a nice trim feature, brakes are way superior to my original Shimano 105's and I love the adjustable hand levers. I give this a 10 in my book.
I used this groupset to build a summer bike, upgrading from Sora. Relatively straightforward to fit although a torque wrench and proper cable cutters are very useful. The hoods are certainly an improvement and feel very comfortable indeed, gear changing is a little slicker and with the 11 - 32 cassette I have greater range than the triple it replaced. Everything including cables etc you need is in the box.
Great price, works just like 6800/9000, but much cheaper and a little heavier. The only problem is the poor selection of cassettes Shimano has produced at the 105 level.
Looks and performs great. Fitted on my first ever road bike. I have ridden other bikes but nothing compared to this group set. I have been using my friends bike which has the next Shimano group set up pricewise. I`m sorry but the 105 Shimano Groupset is on par if not better than the Ultegra.
Bought this as an upgrade to Shimano 105, all arrived safely the next day, fully boxed, but with no instructions, these have to be downloaded from the Shimano website. Once set up the difference from was 105 was really noticeable, the shifting is smooth and precise, the brakes are a massive improvement, the overall feel is of quality throughout, it basically feels as though you have a new bike. Great price and service from Merlin.
Very nice group for the money. I bought it to update my son's race bike and he loves it. Very smooth shifting and spinning, and crank set/bottom bracket is rock solid; 11 speed cog is nice to have too.
Basically last year's ultegra. It shifts beautifully, brakes in a way that really inspires confidence on long descents and looks great too. I like the feel of the hoods, they feel solid and are confortable. As an entire package the 105 group works together flawlessly, and for a price that's unbeatable.
Excellent offer on a fantastic group set. Was looking to upgrade my 20 year old components, which worked fine until my rear wheel collapsed requiring a custom rebuild in order to still be compatible with my antiquated setup. I could not find anything which came close to this in terms of quality and price. Not only recommended, I would buy it again if I had a second bike to outfit.
In a word - excellent. I installed this new 105 groupset on my 2011 Trek 1.5 as an upgrade from a mismatched factory group. I could not be more pleased by Merlin's packing and shipping of the group. With the proper tools, removal of the old and installing the new 11 speed 105 group was easy. Please make sure you check with Merlin to be sure your freehub body can fit an 11 speed cassette. In terms of ride quality and improvement from my prior setup, it feels so incredibly efficient and makes riding much, much better. I would highly recommend this as an upgrade from a lesser factory groupset on any bike!
Great groupset, shifts really well, I have ultegra on another bike and really can't tell the difference, very smooth actions. Highly recommended if you want to slap a set of decent gears on a winter bike.
I am not given to hyperbole but this groupset has transformed my bike. The shifting is slick and the brakes will almost stop:-)you on a sixpence. I upgraded from 105 5600 and the hoods are slightly longer so I had to adjust the rotation of the handlebars to regain a comfortable position. I just want to go out and ride my bike all the time since fitting it. If you need a new groupset put this on your wish list.
Brilliant groupset. I have Dura Ace 9000 on another bike and this compares very well - levers are the same shape, gear changes almost exactly the same quality and brakes are very strong and with progressive lever feel. The chainset is ideal for a stealth build - looks great with a kind of matt finish as opposed to the cheap shiny black of 5700. I was very well looked after by Merlin for this purchase - win, win!
Required a new groupset for by winter bike frame, 105 is the perfect choice for a winter bike after using the 5700 groupset which is reliable and cheap. I opened the box but surprised to find no instructions for the fitting and tweaking of the individual parts, you have to download these from shimano`s dealers fitting instructions when printed of took half a ream of paper with lots of irrelevant stuff. But you DO require these instructions as there are aspects of fitting the front derailleur, sti's and cables that are different from the 5700 groupset. The 5800 groupset works well with very smooth shifting, although the brake calipers are a little disappointing, I expected a little more power after reading about the upgrades, nowhere near as powerful as my Sram force calipers, they will be the only upgrade I will make in the future. The only susceptible difference between the 5700 and 5800 is a slightly smoother gear change 11 speed is not noticeable, and so if the 5700 was significantly cheaper I would recommend to buy that, but in fact you can buy 5800 cheaper so buy it if you require a cheap reliable high performance groupset that is also better looking than the previous model. Just remember to order paper and a new ink cartridge with your order.
Upgrade from Sora 9 speed, triple crank. Fantastic. Shifting feels very precise and smooth, it seems to hold up and not need adjusting as often. Double compact with 11 (11-28) speed is giving me the range I need, flats, descents and hill climbs. Braking is amazing - doesn't require as much effort but still strong and responsive. Merlin delivery nice and fast. Will use again.

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