The Duckmeister wrote:No apology necessary, we all have to start somewhere! Basically, it's all to do with relative distance from the derailleur mounting point to the relevant chainrings. Because the derailleur has to be mounted high enough to clear the big ring, the inner side needs a lot more area to it to be able to reach the really little one, and more importantly, have enough contact to shift the chain properly.
So if I wanted to use a double derailleur (gosh I'm getting good at typing that word ) on my triple, I would either have to mount it lower, where it would then crash into the big chain-ring, or get rid of the biggest ring totally, which has its own issues as you mentioned earlier?
I'm thinking a nice big cassette on the back with a compact crankset is sounding like the simplest option here
I notice quite a few WSD bikes come with a triple 105 crankset, and a 10-speed cassette. I would guess that a 10-speed cassette would have more problems with chain-rubbing than an 8-speed, or is the spacing pretty similar? 30 gears seems like overkill for my humble commuter (and would require new front and back derailleurs and therefore $$)