What is a long cage derailleur?
Rear derailleurs come with different cage sizes to accommodate the varying amount of slack chain created when you move between the large and small sprockets or chainrings. Longer cages enable the derailleur to take up more slack and keep the chain taught.
Do I need a long or medium cage derailleur?
If you are in-between the capacity ranges of the two, which is often the case with mountain bikes, then note the following: long cage derailleurs will accommodate a wider gear range and deliver a better chain line, while medium cage derailleurs are less likely to be hit by rocks on the trail.
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.
Can I put any derailleur on 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.
How do I know if a derailleur will fit my bike?
What is a long cage derailleur used for?
Long cage derailleur It is most often used for 27 or 30 gears combinations and is recommended especially for Cross Country and Marathon competitions to pick up excess chain when using small ratios (small chainrings – small sprockets).
What is the capacity of a Shimano derailleur?
According to Shimano, their derailleur’s rated capacities are 45T for long cages and 30T for short cages.
What is the purpose of a rear derailleur?
We all know that a rear derailleur is used to shift the chain between different sprockets/cogs of the cassette. The cage of a derailleur is the part that you see hanging out. The purpose of the derailleur cage is to pick up slack in the chain and maintain tension.
What happens if the derailleur is too short?
If it is too short, the derailleur is pulled up so much that it physically cannot get the chain up to the largest cog. Conversely, if it is too long, the derailleur won’t be able to maintain enough tension in the chain. Q1.