I'm considering making a minor change to the gearing on my bike.
I'm quite happy keeping the standard chain rings that I have however, I do spit chips a little every time I'm on a hill >7% when everyone around me drops into granny gear on compacts and blithely spins past me using a 34:26 gear while my granny gear is 39:26. (yes, yes, kudos to all of you who don't need granny gear to get up hills).
To resolve this, I'm looking at changing my rear cassette from the 13-26 I currently have (Campag) to a 13:29.
My question then is, how much benefit do you think I might get from changing to the 13-29 cassette? I don't know the configuration of the gears and I'm too tired to look it up right now, but the small one is a 13 and the big one is a 29... I've no idea what's in between. If I have the option to fiddle with the 'in between' gears, what size gears might you recommend?
Bearing in mind that my decision not to change from standards to compacts is founded largely on my being unable to afford a new crankset, so despite that being a potentially good option, it's not going to happen. Not to mention, I like the standards and, given my smallest rear gear is a 13, I want to keep my 53 up front!
Paul, prob loading the web page.
oops. fixed now.
I should check these things when I first do them, sorry.
Frank, the 50/40 setup was an import from Japan - Back when Bridgestone made bikes as well as everything else they do. It was a lovely bike, until I destroyed the rear derrailleur mount earlier this year.
Campy runs 135PCD.
To run smaller than 39 you need compact.
Just change the rear casette and be done with it!
I've found that my current casette goes:
with the 29, I'll have:
(Thanks to Tim B for the link to that info earlier)
With the 29, it's only a 2 or 3 tooth jump at any point along the cassette, is that going to feel like any more of a large-ish jump than I currently have? I'm not sure if a 3 tooth jump is different at the big end of the cassette than at the little end... ??
As for the rear derailleur, I'll have to check that out with a mechanic and then my budget. Thanks :-)
It will feel like a large jump, mine goes 24-28 but realistically you won't be making that great change that often for it to be an issue.You just have to decide if you can live without the 18 tooth cog and a bit less flexibility in the middle of the cluster. For a hubbard like me it makes no difference.
+1 Short cage rear mechs are not nice on 29t.can be quite rough and noisy.
Ahh, Tim, yes, my mistake: only with compacts can you go below 38 teeth on the lower ring for the 130pcd.
Ignore me Juz, I'm confusing myself from one bike to the next; I was thinking of my Giant which is on compacts running 50/34, and writing about my old commuter which is running the 15 year old stuff... after all, it's an 8spd cassette vs a 10spd...no comparison! :)
With what Gemma K noted regarding Campag running 135pcd, and 39 being smallest ring to suit before going to compact, I better understand your constraint; however, it could be worth considering that you might not need to drop all the way down to 34. I stand by what I said, I found a really noticable difference going from a 40 to a 39 on the same sized cassette; so it will depend on the availability of different sized Campag rings: you might find a world of difference with only a small drop. Then, it depends on your fdr... and comparing what provides the better gear range for the dollar: compacts & fdr change(maybe), or cassette and rdr change(again, maybe).
So without any knowledge about Campag component pricing, or any further ado; exit stage left Paul....