3 ms·
I wanted to know if with this system you are able to shift when you are transmitting power, or you also need to prepare your gears before the climb like a mecha
by Glawen 4y ago
I wanted to know if with this system you are able to shift when you are transmitting power, or you also need to prepare your gears before the climb like a mechanical one?
CAN bus is 2 wires and seems an overkill, a LIN bus (single wire) with power seems more suitable.
- andreareina 4y agoStill don't want to shift under high power, though shifting while going uphill is actually doable, I quickly got used to going light on the pedals momentarily. Of course it requires already having a decent cadence to quickly ride out the dead spot.
- exabrial 4y agoRight now this is a function of cassettte/chain design rather than derailleurs; not sure electronic shifting could do anything to improve that situation. Modern Shimano drivetrains with Hyperglide can be shifted under "quite a bit" of torque, but I wouldn't say a 1x12 can be shifted under "full gas". I've yet to break a chain on my 2x11 GRX even at full stupid. My 2x11 even survived Unbound Gravel this gear with the _absolutely_ mudfest of riding conditions in the second half of the 100mi race. I have broke a chain on my 1x12 under full gas though; is an XT Cassette, XT Chain, and XTR derailleur and a plain-ol mechanical shift cable system. All that being said, you absolutely should prep your gears at the same time you're prepping your body position. GRX/XTR and to a lesser extent Di2 allow you to delay this to the last second.
- exabrial 4y agoDi2 uses a "barrel connector" so the thing appears like one wire to the consumer. This also allows DC power to be transmitted over the single wire. On a bike, you don't have a return path for current.... Never heard of a LIN bus, learn something new every day :)