Why no multishift?
- Thread starter roilev
- Start date
Back in the old days when everyone was rollin' Amish Style, people would sometimes break chains by shifting under heavy load. Doing multiple shifts under heavy load exacerbated the problem.
Nowadays the same problem still exists, except we have the added power of the motor, PLUS the overrun. Beginners might be tempted to run through the whole cassette, with the chain lagging behind, while under power. A broken chain will be the result. That's why SRAM recommends one gear per click of the shifter.
Personally, I always ran my AXS shifters in multi-shift, but I'm very aware of how fast I'm shifting and how fast the chain is jumping cogs. I never broke a chain on my AXS bikes.
Nowadays we have the tranny derailleurs and flattop chains. While I still try to shift smoothly when conditions allow, I'm not averse to just slamming it gear to gear.
So if you're hyper-aware of the quality of your shifting, go ahead and set it to multi shift. If you're the sort of rider whose shifting sounds like a rock crusher, set it up to shift one gear at a time.
Nowadays the same problem still exists, except we have the added power of the motor, PLUS the overrun. Beginners might be tempted to run through the whole cassette, with the chain lagging behind, while under power. A broken chain will be the result. That's why SRAM recommends one gear per click of the shifter.
Personally, I always ran my AXS shifters in multi-shift, but I'm very aware of how fast I'm shifting and how fast the chain is jumping cogs. I never broke a chain on my AXS bikes.
Nowadays we have the tranny derailleurs and flattop chains. While I still try to shift smoothly when conditions allow, I'm not averse to just slamming it gear to gear.
So if you're hyper-aware of the quality of your shifting, go ahead and set it to multi shift. If you're the sort of rider whose shifting sounds like a rock crusher, set it up to shift one gear at a time.
Chains aren't designed to take much if any side load. Pushing chains from one sprocket to another, changing gear, puts the chain under side load. Pushing the chain across multiple sprockets at the same time increases that side load considerably. Even without the extra load provided by the eMTB motor many of us have experienced a broken chain caused by the side load imposed by the derailleur pushing the chain sideways while chaining gear especially if we are pushing the pedals hard at the time. Its not a good idea to change gear 'under load', you can hear the result. Changing multiple gears at once is worse because the side load is so much more and with the considerable load provided by the motor increases the likelihood of a broken chain.
sethimus
Active member
because most ebikers need to be saved from themselves
Multi shift doesn't have to cause problems. My Shimano running gear with di2 will run up and down the cassette at a single press if you hold it and keep pedalling. The bike has now covered 35000km and never a broken chain.
Polar
Well-known member
On the same drivtrain or is it a zero to much?
Same drive train and not a zero too much. 7 years trouble free but finally the bearings are done and no one wants to open the motor and replace them
Polar
Well-known member
That's insane, if it could be 100% documentated the company should be informed about it and they could use it in marketing and you should get a new set for free.
sethimus
Active member
why? they would go out of business
Polar
Well-known member
Quality costs just increase the price tenfold
A new motor wouldn't go astray. I know Shimano and others are in the business of selling new gear but I am surprised the EU or others haven't targeted manufacturers who's gear is non serviceable. The bike was expensive, for me, the running gear has been well maintained but the bike is stuffed until the motor is replaced. The
Du e8000 is more or less obsolete now so the only option is an EP8. At least it bolts straight in and only requires a couple of cable upgrades as the new motor connects via smaller diameter connectors
