If you're having any trouble choosing the right derailleur, then feel free to contact us and we'll sort it out! Michael has always loved bikes, and began turning his passion into a career while still in high school, selling MTB parts from underneath his parent's house. Things have transformed since then and he's now co-owner of MTB Direct. His regular role is project management, especially around some rad new features for the site.
When he's not out riding one of his many mountain bikes, he's looking after his two little girls and teaching them to ride! Javascript is disabled on your browser. To view this site, you must enable JavaScript or upgrade to a JavaScript-capable browser. Blog How to choose derailleur cage length. December 31, We were recently asked: "How do I tell if I need a medium or long rear derailleur?
Gearing up front is , possible Right at the limit for GS, but the 32 would be bigger than the reported max cassette. The only real way of finding out is to test for yourself. No guarantees it will work fine on a short-cage derailleur, even though capacity checks out fine. The usual trick to making this work is to wind in as much B-tension screw as you can. What are the various lengths? This would give you a percent overall gear range, and may let you run a short cage derailleur because there are only 27 teeth difference between the largest and smallest cog.
Good point. Your article is particularly well written and clear. Also, great examples. Your efforts are appreciated. You left out single chainring cranksets here. I have a Giant MTB with a rear cassette of t which equals 31t. Thanks for the formula. Maybe read the post again. Ahhh, I skpped that one because it looked like it would have more than one chainring. My bad. Does this mean that the indexing ratio is different from a 6 speed RD?
Or do they not mention 6 speed because they assume that no one will be fitting an Altus to an old six speed bike? The cage swap is only half the equation.
The medium-cage derailleur also has tighter angles in its knuckles. You are commenting using your WordPress. You are commenting using your Google account.
You are commenting using your Twitter account. You are commenting using your Facebook account. Notify me of new comments via email. Notify me of new posts via email. This site uses Akismet to reduce spam. Learn how your comment data is processed. Skip to content Ahh, the good old rear derailleur.
Rated max chain capacity is 43T. Rated max chain capacity is 25T. Bino in Dahon Vitesse T10 form. An excerpt from the service instructions for the RD rear derailleur. It bears mentioning that the quoted capacity of derailleurs tends to be pretty conservative and, in practical terms, you could almost certainly get away with using a short length cage derailleur in this circumstance, so long as you avoided extreme e.
Regular rear derailleurs rely solely on the tension provided by the main pivot to keep the chain in place. A clutch derailleur essentially increases the resistance this pivot provides — either through a clutch or more complex electro-hydraulic systems as seen on SRAM AXS — resisting fore and aft movement of the derailleur cage, making for a far quieter and more reliable drivetrain.
But what should you look for in a rear mech? A more expensive derailleur will usually weigh less than its cheaper brethren. This is achieved by using more exotic materials e.
More expensive derailleurs often use harder wearing components and are built to closer tolerances, so will last longer than cheaper models. This is particularly apparent with jockey wheels, where cheaper derailleurs will often spin on basic steel bushings. Since everything up to this point has been tech-heavy, we can afford to be superficial for a moment.
Higher-end derailleurs can be jewel-like in their quality, featuring all sorts of beautiful, polished panels and jazzy, bright anodising. Jack Luke is the deputy editor at BikeRadar and has been fettling with bikes for his whole life. Always in search of the hippest new niche in cycling, Jack is a self-confessed gravel dork, fixie-botherer, tandem-evangelist and hill climb try hard. Jack thinks nothing of bikepacking after work to sleep in a ditch or taking on a daft challenge for the BikeRadar YouTube channel.
He is also a regular contributor to the BikeRadar podcast. With a near encyclopaedic knowledge of cycling tech, ranging from the most esoteric retro niche to the most cutting-edge modern kit, Jack takes pride in his ability to seek out stories that would otherwise go unreported. He is also particularly fond of tan-wall tyres, dynamo lights, cup and cone bearings, and skids. Jack has been writing about and testing bikes for more than five years now, has a background working in bike shops for years before that, and is regularly found riding a mix of weird and wonderful machines.
Jack can also often be seen zooming about with his partner aboard their beloved tandem, Cecil. Home Advice Buying Guides A complete guide to rear derailleurs. Related reading Road bike groupsets: everything you need to know Mountain bike groupsets: everything you need to know Best road bikes: how to choose the right one for you Best mountain bike: how to choose the right one for you. Tom Wragg. Immediate Media.
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