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That means you can switch to a semi-compact configuration merely by swapping the chainrings. One reason that alternative chainring sizes have become popular in recent years is the wider range of cassette sprockets available.
A disadvantage of the standard crankset with an old-fashioned gear range is that it often forced cyclists out of the saddle on steeper climbs, placing a significant strain on their core. A semi-compact crankset is typically found on performance road bikes, so that tells you something about the target user. Anyone that likes to ride fast over flat terrain and perhaps climb sitting down will enjoy the semi-compact.
You can learn a lot just by looking at the gear choices you naturally make. If you find yourself often on the biggest or smallest rear sprockets, it may be worth trying a different crankset. As an Amazon Associate I earn from qualifying purchases.
Updated on: August 3, Pinterest Facebook. Mark W. I want to help others get the most out of cycling. And of course the gears on your rear cog play into the ratios.
Cassettes — the gears on the back wheel — come in a wide range of options, from around T up to T. An T is a fairly common cassette. In general, a compact crank means the uphills will feel easier, but you will lack the ultimate top end.
That said, most riders will seldom use the ultimate top end on a standard crank a 53T chainring with an 11T cog unless pedaling at speed downhill. Home Features What is a compact crank? Compact cranksets are becoming increasingly popular, a trend driven not only by aging baby boomers and the rise of recreational cycling, but also by a growing number of competitive athletes realizing their benefits. The cycling industry has warmed to compacts, with ever more crankset models and compact-specced bikes available.
In this post, I hope to convince you that compact cranksets merit consideration from cyclists and triathletes of all levels, from beginners to weekend warriors to pros. Compact-curious cyclists come from two camps: those riding triples cranksets and those riding standard double cranksets. For many reasons and for many applications, compacts paired with super wide range cassettes e.
This post is mainly addressed to triathletes and cyclists riding standard doubles. Some sources recommend compact or standard cranksets based on power output. Specifically, are you ever running out of gears, never using certain gears or having to stand to climb every hill? Compacts can provide a wider gear range , especially at the low end. The comparison could be done in terms of gear inches or ratios, but most people find it easier to relate to speed. Compact setups can have fewer redundant gears compared to standards.
Looking at the graph above, you can see that there is less overlap in the ranges covered by the big and small chainrings. Compacts can improve chainline resulting in improved drivetrain efficiency. Chain drives are very efficient provided the chain runs in a fairly straight line.
Perfect chainline occurs when the chainring and rear sprocket are in the same plane. The more crooked the path of the chain, the greater the power-sapping frictional losses and wear on drivetrain parts. For this reason, you should avoid certain gearing combinations: big chainring to biggest rear sprocket and small chainring to smaller rear sprockets.
From my own experience and from observing other cyclists, people who are overgeared on standard cranks i. Related to the previous point, a compact allows you to tackle more terrain in your big chainring meaning less front shifting.
This produces less wear on the chainrings, chain and front derailleur. There is also less risk of dropping your chain.
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