Readers ask: How Do You Know What Size Front Derailleur For Your Road Bike?

What size front derailleur do I need?

“Clamp-On” front derailleurs come with a clamp of a specific diameter, which are meant to fit around different kinds of bicycle frames. Most frames will be either 28.6mm, 31.8mm or 34.9mm in diameter, but certain bikes made before the 1980s will have a slightly smaller tube diameter.

What derailleur will fit my bike?

A derailleur for your mountain bike should match the specifications on the original derailleur. That is, while it doesn’t need to be the same model of derailleur, it does need to be the same brand, in almost every case. It also needs to match the number of gears, or have more intended.

Are front derailleurs necessary?

Are Front Derailleurs Necessary? These days front derailleurs are essentially not necessary, on mountain bikes at least. Now even high-end road bikes are starting to lose their front derailleurs. With a larger rear cassette, it’s possible to get the same number of gears without the need for a front derailleur.

Will a 9 speed front derailleur work with 7 speed?

Yes. A front derailleur marketed as for a 9 speed system will work normally with your 7 speed set up.

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Can I use a 10-speed front derailleur on a 9-speed?

Support us! The cable pull is different for the 10-speed rear derailleurs and the 9-speed rear derailleurs won’t line up properly with the cogs when used with a 10-speed shifter and cassette.

What is Shimano E type?

E-type (aka low direct mount, E2-type, S3) Shimano’s E-type front derailleur traditionally included a backplate that was held behind a threaded bottom bracket. Nowadays, ‘E-type’ is more commonly sold without this backing plate and is sometimes referred to as a ‘low direct mount’ or ‘E2-type’ front derailleur.

How do I choose a derailleur?

When buying a new rear derailleur be sure to match it with your drivetrain ‘speed’. 10-speed drivetrains use narrower chains than 9-speed so you’ll need a mech to match. Most rear mechs are made of a polymer and alloy mix but you’ll find carbon fibre in top-end models to shave even more weight.

How can you tell a fake Shimano?

Clean Side On The Chain Original one should be unengraved from one side, and it looks like this. Fake ones are engraved with shimano and chain models for both sides of the chain and randomly sorted. If you find that it’s a big turn off. Strong point is that you can use it especially when buying an unpackaged one.

How do I know what model derailleur I have?

quite easy to determine the model of your derailleur. Simply look on the back of the derailleur body. The model number should be stamped there. It should read RD Mxxx.

Is SRAM better than Shimano?

Shimano and SRAM both make quality products, but their approach and styles are different. Looking at the current component landscape, it can be said that Shimano is generally the more conservative of the two. Over the last decade, SRAM has pursued drivetrain innovation more aggressively.

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What is an 11 28 cassette?

Currently, the most common gearing setup on new road bikes is a 50/34 chainset with an 11-28 cassette. This means that the big and small chainring have 50 and 34 teeth, respectively, and the cassette’s smallest cog has 11 teeth and its largest cog has 28 teeth.

Can I use a MTB derailleur on a road bike?

As long as they are designed with the same cable pull ratio, they are compatible, you can easily fit an MTB derailleur to a road frame. Front derailleur are sized accordingly to the chainring and whether the crankset is double or triple.

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