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They’re called groupsets, drivetrains and components, but they all refer to the group of parts responsible for shifting and braking. Choosing road bike components is one of the biggest decisions you’ll make when buying a new bike or upgrading an existing one. Do you go with mechanical or electronic shifting or use a compact or standard crankset? We’re inundated with options, but it pays to take the time to match your riding style to the right components. It could mean the difference between spinning confidently up a hill and feeling constantly bogged down in your easiest gear.
Here are a few things to consider as you make your decision:
What kind of riding will you do?
Riding a time trial is going to require vastly different gearing than climbing hills. Some riders have different cassettes and wheels for different riding conditions, but not all of us have this luxury, so take your terrain into consideration when buying or upgrading your road bike components.
Do you want to perform your own maintenance?
If so then I suggest staying away from disc brakes and electronic shifting. But do your research first and know what you’re getting into. For example, Campagnolo requires its own expensive custom tools for certain installations on its high end parts. Know what kind of investment you’re getting into from the start.
Stiff, light parts often come at a premium, but they’re not always necessary.
If you’re looking for an instant speed upgrade, lightening your wheelset will have more of an impact than upgrading from Ultegra to Dura-Ace. Technology tends to trickle down from the top, so you can save some cash and ride Ultegra, while still enjoying many of the technological benefits of Dura-Ace. If you’re leaning toward electronic, you can save by opting for Ultegra Di2 over Dura-Ace Di2. The performance is nearly identical and the savings is due to the fact that the Ultegra Di2 is slightly heavier.
State of the art Di2 electronic technology for instant, accurate shifts first time, every time, at the push of a button. Now 11-speed compatible, with enhanced feedback and improved ergonomics for easier access to the shift buttons from the top of the hoods.
What’s included in a group set?
- Front and rear derailleur
- Shifters (which have integrated brake levers)
- Rear cassette
Shimano's E-Tube Di2 Junction Box (also known as the B junction) connects all your component and battery wires to make assembly much easier. It's a crucial item along with the five required wire sections to operate your Ultegra 6770, Ultegra 6870, or Dura-Ace 9070 Di2 shift system.
SRAM vs Shimano vs Campagnolo
Here are the drivetrains offered by the big three companies, listed from basic to super bling!
Claris, Sora, Tiagra, 105, Ultegra and Dura-Ace.
Apex, Rival, Force, Red
Veloce, Athena, Chorus, Record, Super Record
If you’re looking to compare, it’s safe to say that SRAM Force, Campagnolo Athena and Shimano Ultegra are similar and fairly indistinguishable, though the price varies between the three with Shimano generally being the cheapest and Campagnolo the most expensive choice.
How do road bike components differ?
As you move from entry level to higher end, the parts are lighter and tend to perform better. The shifting mechanism itself varies slightly between the three manufacturers, so it’s not a bad idea to wrap your hands around each set of shifters before committing to one brand.
To keep the cost down, bikes are often sold with a mix of road bike components, which isn’t necessarily a bad thing. Manufacturers swap out brakes and cranksets for lesser components to keep the price down.
In this case, you can always swap out lesser components for lighter, better performing ones at any time. If you know exactly what you want from the start or have some spare parts, you could also buy a frame and build it up.
Most beginners and enthusiasts (non racers) do fine with mixed component groups. Sure, there is a small weight penalty, but unless you’ve spend hundreds of hours in the saddle, you probably won’t notice a difference. However this is a great way to save money right off the bat. If you want to save weight, invest in a lighter crankset, cassette and brakes and save your money on shifters and derailleurs.
Though disc brakes have been added to the mix, most road bikes are still sold with caliper rim brakes. Do you need disc brakes?
Cranksets are available as triples or doubles, which refers to how many chainrings they have.
A compact crankset usually comes with a 50/34. This represents the number of teeth on each ring. The larger the number, the harder the gear, which translates into being able to turn over higher speeds, but with more tension. Compacts are ideal for beginners or those who ride on varying terrain.
Standard gearing is 53/39, which is popular with racers.
Looking for a compromise? Try a mid-compact with 52/36 gearing.
Triples (50/39/30) have the greatest range of gears, though they can very nearly be achieved with a compact crankset. Today triples are most commonly used on touring bikes.
Crank arm lengths vary between 160-180mm and are based on the size of the bike frame.
A longer crank arm actually offers a greater mechanical advantage, but changes the angles associated with the bike’s overall fit. I’d recommend working with a fitter if you want to tinker with the length of your crank arms.
This refers to the cluster of sprockets on the rear wheel.
A rear cassette with a close ratio offers small jumps between gears, which is ideal for riding on flat terrain or in a time trial.
A wider range is more versatile and ideal for climbing.
The number of rings on the cassette refers to how many speeds the bike has. Just keep in mind that a larger gear on the back requires a long cage derailleur.
The chain you choose is also dependent on the number of gears you have. Generally the more speeds the bike has, the narrower the chain.
There are two types of front derailleurs: Band-clamp (or band-on) and braze-on. A braze-on is riveted to the frame and necessary for unusual tube shapes that can’t handle a clamp.
Braze-on has a round clamp which bolts onto a round frame.
Rear derailleurs also vary depending on how many speeds the bike has.
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Photo credit: www.billbonebikelaw.com