What is the diameter of a 40T chainring?
Chainring Diameter by Tooth Count
| Tooth Count | Diameter (mm) | Diameter (in) |
|---|---|---|
| 40T | 168.4mm | 6.65in |
| 42T | 176.5mm | 6.97in |
| 44T | 184.6mm | 7.28in |
| 46T | 192.7mm | 7.60in |
What is a 50 34 chainring?
Compact chainset A compact chainset has a 50-tooth outer chainring and a 34-tooth inner chainring. This means that the gears are lower (easier to turn, but they’ll progress you a shorter distance per pedal revolution) than you get with a 53/39 chainset (above) with the same cassette.
Is a bigger chainring more efficient?
Bigger chainrings and cassette cogs run more efficiently than smaller ones but extreme cross-chaining can cancel out those efficiency gains.
Is 1x better than 3x?
Higher price – generally, a good quality 1x groupset costs more than a 2x, or 3x system of similar quality. Greater drivetrain mechanical losses – because of more severe chain angle (cross-chaining) and fewer chainring teeth in some gear combinations.
What chainrings do pros use?
Pros often use a 55×11-tooth high gear for time trials. On flat or rolling stages they might have 53/39T chainrings with an 11-21T cassette. In moderate mountains they switch to a large cog of 23T or 25T.
Is a 40T chainring better than a 32T?
This is good for riders who struggle with climbing, regularly ride steep terrain, or carry extra weight with bike bags. On a mountain bike, the small change of swapping from a 32t to a 30t chainring gives you gearing that is 6.7% easier. For gravel, going from a 42t to a 40t provides 5% easier gearing.
How many chainrings does a road bike have?
Most road bikes have two (and occasionally three) chainrings, with the smaller rings located inboard of the larger chainrings. Most modern mountain bikes are spec’d with just one chainring (known as a 1x set-up), though you will still encounter some riders using 2x and occasionally 3x systems, though the latter is increasingly rare.
What is a mid-sized chainring?
These sizes became standard because they mirror the size of the middle (and most used) chainring in older 3x drivetrains. Cassettes, rear derailleurs, and bikes have been designed to accommodate this mid-sized chainring. For many riders, this will be fine for everything from recreational riding to racing.
What size chainrings do I Need?
Size (indicated by the chainring’s number of teeth) typically run from 26t to 53t, though you find chainrings as small as 20t and as large as 60t in rare instances.