Our Rene Herse cranks are available with chainrings from 24 to 52 teeth, in single, double and triple configurations, including 11-speed compatible versions. We even offer tandem cranks. That way, riders can benefit from customized gearing, but it also means that we stock a lot of chainrings. We try to keep all ring sizes in stock, but sometimes, demand outpaces supply. We’ve just received a new shipment, and all chainrings are back in stock.
It’s easy to see why the big makers limit their chainrings to a few combinations, but the downside is that most riders find themselves with gearing that doesn’t work well for their riding styles. It’s not just that the gears are usually to large, but also that you need to make far too many front shifts.
Why are front shifts so disruptive? With a 50 x 34, the small ring is 32% smaller than the big one. That is a huge step. You probably need a gear that is 5-10% smaller, not 32%, so you shift 3-4 cogs on the rear to compensate until you finally arrive in the gear you need. Multiple shifts take time: Your speed drops, and your rhythm is gone.
To solve this problem, you could make the step between the chainrings smaller, like the 46 x 36 found on some cyclocross cranks in the past. Front shifts now are 22%, and you only need a single shift on the rear to get back to your optimum cadence. The drawback is the limited gear range: A 36-tooth small ring is fine for ‘cross, but most riders need smaller gears when climbing mountain passes.
However, the smaller ‘big’ ring of the cyclocross setup provides the answer to the original problem. If we select our big chainring so that we ride in the middle of the rear cassette during normal riding, we can respond to small changes with just a few shifts on the rear. Pick up a tailwind? Click and we have a bigger gear. A small rise in the road? Click-click-click – a few seamless downshifts as our speed drops, and we are over the crest. No front shift required!
With a 46-tooth big ring, I can surge across gentle hills with just a few shifts on the rear. That means I can select my ‘small’ ring so that I can climb even the steepest mountain passes. For me, that is a 30-tooth. Now the large step between chainrings is OK, because I don’t shift on the front unless I get to a really steep hill. A hill that steep breaks my rhythm no matter what.
Your ideal gearing depends on a number of factors: your cadence, your strength and speed, and the terrain where you ride. From your current setup, you know which gears you use when riding on flat roads. Select your big chainring so that these gears are in the middle of the cassette, and your riding will be much smoother. That is the secret behind custom gearing. The small chainring can be up to 16 teeth smaller, because that is the maximum that modern derailleurs can handle reliably.
We offer our Rene Herse cranks with so many chainrings because we recognize the need for custom gearing. Click here for more information about Rene Herse cranks.
Photo credit: Nicolas Joly (Photo 4).
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