Hi all, I’m currently trying to work out how you determine if / when to change front crank size. Currently I’ve got dura-ace 50/34 - 30/11 (front - rear). That’s OK for most of the time, but there are times when I’m spinning out (basically you can’t effectively pedal > 55Kph). I also do a lot of hill climbing, where I use 34-30 on a couple of the steepest pinches.
It doesn’t happen a lot, but it’s happening more often as I’m slowly getting stronger. I’ve had a look at the new cranks on offer, and the next steps up would be 52/36, 53/39.
What I’d really like, is a 52-34 or 54-34 (i.e. retain the smaller ring), but I assume there’s a good physics based reason why they don’t do that (as opposed to a marketing-segment-based-reason).
52 has 4% more teeth than 50… but does that translate in a linear fashion to the max speed? I imagine not, because you’re looking at the circumference, so wondering what real world experience people have making this type of change?
Other stuff in case it’s relevant…
- I only use this bike on the road - not on a trainer
- Typical road ride is 150Km-180Km 2000-4000m climbing
This isn’t urgent, but it’s on the wish list of “upgrades I’d like but don’t really need”