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Shimano
5800 Groupset

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The workhorse goes to 11.

With some radical new updates for 2015, the new Shimano 105 5800 Group may be the best value in cycling components, bringing a level of function that rivals the top end of most manufacturers' lines to a price point that feels more like entry level. It's still got the same work ethic that it's always had (just try saying "Shimano's 105 groupset" aloud without adding "workhorse"), but with some updates that may make you rethink splurging on the gear you see in the ProTour.


For us, the two most exciting aspects of the new Shimano 105 5800 Groupset are that it made the jump to 11-speed and that the crankset is now rocking the same efficient, lightweight, and gorgeous four-arm design as Ultegra, Dura-Ace, and — starting in 2015 — a certain Italian manufacturer. There are some functional details involving changes to springs, shifting, and hood shape, but so what. We like big changes, and these are big, big changes.


We've already addressed the 11-speed thing, which really speaks for itself, so on to the crankset. While 105 5700 already took advantage of Shimano's Hollowtech II technology, it weighed more than 100 grams more than the 5800 version. With that weight loss, it's now only around 100 grams heavier than the world class Dura-Ace crankset. Barring some extra material that its more expensive brother has had removed, the new 105 crankset is nearly identical to the Ultegra version. This is one of the best function-to-dollars ratios in cycling, and it almost single-handedly bumps 105 up a notch on the groupset hierarchy.


The new hood and lever shape address one of the main critiques that have followed many of Shimano's groupsets throughout the years. The hoods and levers have been slightly shrunken, so they fit unobtrusively in your hand and no longer suffer from the bulky ray-gun look of generations past. For its 5800 rebirth, 105's levers are looking more Dura-Ace and less Marvin. The levers' throw has been reduced and, though they have Shimano's classic light touch, the click of the shift is definite enough to know when you've effected a gear change. The reach of the levers is adjustable by up to ten millimeters, a much more elegant and logical solution than inserting spacers.


The front derailleur's longer arm means you get more leverage on shifts, which in turn translates up the cables to the shift lever for less effort on the lever throw. The spring mechanism is also trickle-down tech, as it shifts with more speed and precision than previous iterations. This groupset includes the braze-on version for ultimate flexibility in installation.


The rear derailleur's spring, geometry, and cable pitch redesigns net responsive shifting doesn't hover between cogs, but instead dives through shifts for immediate gear changes whether you're attacking uphill or caught in big gearing at a stoplight. And we can't stress enough that it's 11-speed now.


The rear derailleur coaches the chain across an 11-28t cassette, a gearing that we appreciate for the mix of epic climbing and fast descending around our home office in Park City, Utah. The 28 will save your knees on pitches topping 20 percent, but the 11 keeps you from spinning out if there's any advantage to be gained by pedaling on descents. Despite including one extra cog, the gears aren't thinned down. They're the same size as the ten speed cogs, so they enjoy the same durability as their predecessors.


The chain and brake calipers round out the groupset. The chain incorporates Shimano's Sil-Tec treatment to reduce friction. Fluorine particles embedded in the chain's surface result in a claimed 60% less rotational sliding friction, 2.7 fewer decibels of chain noise, 30% more mud and debris clearing, and a 20% longer wear life than chains with zinc-nickel plating. The dual-pivot brakes boost stopping power by 10% over the previous, 5700 calipers, and they accommodate 28mm tires.


The Shimano 105 5800 Groupset is available with three different crankarm lengths: 170mm, 172.5mm, and 175mm. All three variations include compact (50/34t) chainrings and a cassette range of 11-28t.


Details

  • Includes crankset, derailleurs, bottom bracket, cassette, chain, and brakes
  • Four-arm spider utilizes common BCD for both compact and standard chainrings
  • 11-speed drivetrain
  • Adjustable lever reach
  • Dual-pivot brakes
  • Item #SHI006D
Shift Levers
Shimano 105 ST-5800 11-spd
Front Derailleur
Shimano 105 FD-5800 11-speed braze-on
Rear Derailleur
Shimano 105 RD-5800 11-speed
Brake Calipers
Shimano 105 BR-5800
Compatible Components
included Shimano SM-BBR60 bottom bracket
Set Weight
2571 g
Recommended Use
cycling
Manufacturer Warranty
2 years

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