Shimano Ultegra R8000, Crankset, R8000 Derailleur, Pedals. However, purchasing a gruppo is not required; my personal bike is a mix of Suntour shifters, Mavic derailleurs and cranks, Dura-Ace brake levers and Shimano XTR brakes, and it works great. Shimano Ultegra components.
Gruppos are also one of the ways that bicycle fanatics measure each other’s level of obscure knowledge about the history of the various part manufacturers. The highest end parts (Record and Dura-Ace) get the most attention, best engineering, and nicest finishes, and are thus often the most desired. However, because of the sacrifices made to make them lightweight for racing, they are the most fragile.
Many cyclists concerned more with durability than pure racing speed settle for middle gruppos, such as Shimano 105. Many touring bikes come kitted out with 105 stock for this reason.
Shimano Ultegra R8000, Crankset, Derailleur, Pedals
Bike theft is rampant in all metropolitan areas. You should be prepared to spend 20 percent of the value of your bike on security. There is no perfect locking system for a bicycle. The purpose of a lock is to slow down a thief, and hopefully slowing down the thief will make him give up on your bike because of the challenge.
That said, no matter how nice a lock you get, if you leave it locked in a bad enough area long enough, the bike or parts of the bike will get stolen. Locking up a bike outside overnight is almost never a good idea. While pedestrian traffic might make the two minutes it takes to break a nice lock too risky for a thief at 10 p.m., at 4 a.m. with no one around bike thieves can work undeterred for as long as they need to get access to your ride.
Additionally, bike thieves will go anywhere: in the basement garages of apartment blocks, in the courtyards of courtyard apartments, on fourth-floor balconies. If they can’t get your whole bike, they will take whatever else they can, including wheels, seats, even pedals.
A better locking solution is one that secures your wheels. One option is the New York–style chain: thick, heavy chains, usually wrapped in an inner tube or cloth sleeve so it doesn’t scratch your bike. Running this through both of your wheels, your frame, and a secure area to lock provides very good security. However, these chains are heavy.
The solution I have used for the last decade is locking skewers: replace the quick-release skewers that come with your wheel skewers with custom keyed nuts that only open if you have the keyed wrench. Available from several manufactures, they are lightweight and provide a good measure of security.
Though they also aren’t perfect and can be opened by a determined thief with time to work and a few tools, they provide enough security that I have ridden the same wheelset since 2000 without them being stolen, despite regularly locking my bike in front of restaurants, bars, and parties on the streets of Los Angeles until late in the evening.
U-locks generally come in a variety of price points based on the hardness of the steel used to make them. Do not scrimp on spending on a lock; cheap locks are easy to break. The smaller the U of the U-lock, the harder it is for a thief to get leverage, and the more secure the bike. Smaller U-locks are also lighter and easier to carry, making them more convenient—stick one in your back pocket and go.
A simple U-lock doesn’t offer any protection for your wheels, however. While you could purchase a long U-lock, take the front wheel off and put it by your rear wheel, and run the long U-lock through the whole assembly, this has several drawbacks. With wheel locks and a small U-lock you can roll up to any parking meter in the city and lock your bike in a matter of seconds. The small U-lock is too small to slide over the top of the parking meter by a thief.
Saddle security is also important: run a length of bicycle chain around your chainstays (the tubes that connect bottom bracket and rear fork ends) and up through the metal saddle rails that hold your seat onto the seatpost to prevent it from being stolen. Many wrap this chain in a tube or electric tape to prevent it from scratching the frame.