Take the 2-minute tour ×
Bicycles Stack Exchange is a question and answer site for people who build and repair bicycles, people who train cycling, or commute on bicycles. It's 100% free, no registration required.

I've seen fixies with internal hubs, but a non-freewheeling rear wheel with deraillers seems to be unrepresented:

            |        Freewheel?        |
Derailler?  |      Yes      |    No    |  
      Yes   | Standard bike |    ??    |
       No   | Single-speed  |  Fixie   |

Practicality aside, is there a mechanical constraint involved here? What happens if you try it?

share|improve this question
add comment

1 Answer 1

up vote 11 down vote accepted

For the same reason you can't have a fixie with a chain tensioner.

The load on the chain when slowing a fixie is too great and in the wrong direction for a derailler or tensioner to hold. The cage will be pulled forward and your chain will skip make a nasty noise and most likely come off or break something expensive.

share|improve this answer
    
the top part of the chain will also droop and might catch on something –  ratchet freak May 27 '13 at 12:46
    
*The something expensive is often bending/removing the derailleur tab from the frame. Either that or throwing the tensioner cage into the rear spokes. Both are bad news. –  WTHarper May 27 '13 at 13:10
1  
@WTHarper - Though that latter is a good argument for a spoke guard, even though they are considered very un-cool. –  Daniel R Hicks May 27 '13 at 18:28
2  
@DanielRHicks Pie plates are so uncool they might be cool again... –  WTHarper May 27 '13 at 18:49
add comment

Your Answer

 
discard

By posting your answer, you agree to the privacy policy and terms of service.

Not the answer you're looking for? Browse other questions tagged or ask your own question.