We get this question once a while, espcially from first time road bikers.
"I shifted from small chain ring to big chain ring but it doesn't shift, why?"
The answer is - You need to shift twice.
Shimano has a cool feature on the road (front)deraillers and front shifters that lets you take maximum advantage of the gear ratios.
So Claris is a 2x system, two chainrings, simple. But the left shifter doesn’t just give you one clean click per chainring. There are actually two clicks within a shift, and that second subtle one is the “trim.” It’s not a third gear, it’s a micro-adjustment of the front derailleur cage.
Here’s how it plays out in real riding. Say you’re on the small chainring. Everything feels fine when you’re somewhere in the middle of the cassette. But as you start shifting toward the smaller rear cogs (harder gears), the chain angle increases and you might hear that faint rubbing sound. Most people either ignore it or immediately shift to the big ring. But there’s a better move, you give the shifter a small extra push, not a full shift, just a half-click. The derailleur cage moves slightly outward, just enough to stop the rubbing, while you’re still on the small ring.
Same story on the big chainring, but in reverse. You shift up to the big ring with a proper full click. Now as you start moving toward the larger cogs at the back (easier gears), again the chain angle gets extreme and you can get rubbing on the other side of the cage. Instead of dropping back to the small ring, you do a light inward click, that’s trim again, and it recenters the cage just enough to quiet everything down.
Once you understand this, you realize the front shifter isn’t just “click once - change ring.” It’s more like a two-stage action, a firm click moves the chain between rings, and a softer follow-up click fine-tunes the derailleur position for your current cassette position.
A couple of concrete examples: cruising on flat roads in the small chain ring and you shift the rear all the way to the smallest 2 - 3 cogs, you’ll likely need that outward trim to avoid chain rub. Or you’re climbing in the big ring (not ideal, but happens), sitting on the largest 2 - 3 cogs, that’s where the inward trim saves you from chain rub again.
Trim isn’t some hidden feature, it’s something you’re supposed to use regularly as you move across the cassette. It basically expands the usable range of each chainring without forcing you to constantly jump between rings.
Of course, it doesn’t mean “go wild with cross-chaining.” Big-big and small-small are still not great for wear. But trim is Shimano’s way of making real-world riding smoother, quieter, and less annoying when you’re not perfectly in the middle of the cassette all the time.
Have you used the trim feature intentionally? or used it intuitively? or never used?
Once you start using trim properly, Claris feels way more refined than it gets credit for.
Guess what, the trim feature is available also on Sora.