I haven't had the Aventon Sinch for very long and I'm no bicycling or e-bike expert but I have some thoughts which may be helpful for those considering getting this bicycle or another.
- It's a pretty nice bike. Feels pretty smooth and the pedal assist and such work pretty well. Seems to be solidly engineered.
- Along with solidity comes weight. If you are used to hefting a nice 10-speed road bicycle then this bike may surprise you. It's heavy and if you have difficulty lifting you may want to lifting one of these before you buy one.
- Sizing is interesting. It seems to be marketed for 5'-2" to 6'-5". Well, I'm a bit over 6'2" and I don't get as much pedal extension as I'd like for my legs. It's OK but not great and people who are relatively tall may want to consider whether it suits them. I'm OK with it and I don't think I could do any better with another folder.
- The handle bar is straight. That doesn't sound bad but that really can be a problem - mostly because the electronic controller sticks up and if you have to turn your bike over for repairs along the road you could easily damage that expensive part. I've gotten a u-shaped handlebar which I hope to install this weekend and that will give at least some protection. I've also ordered (but not yet received) a Handlebar jack which should be very good for repairing stuff.
- The handlebar is not very long. Not necessarily bad at all, but it makes the thing feel just a little twitchier. My replacement will be a little longer, but not a whole lot. The longer handlebar, however, will make things less compact so there's a trade-off.
- The way the frame is built I don't really find any really good way to put the thing into the clamp of a bicycle stand. It can be done and can be pretty secure, but it's not really good.
- In the video(s) you can quickly unfold the frame and latch it into place. Don't believe/trust that. The cables that run through the area can be trapped and/or damaged and you have to take care that they are routed properly as you straighten/close the frame.
- On YouTube they have videos for installing the fenders and another for installing the rack. The fender video isn't too bad although they really should do new ones as there seems to have been a change in the design which they don't address - not a big deal but they should try to make it easy.
- The video for rack installation isn't too bad except they tell you to leave out the spacer and I think the spacer must be used for proper clearance and operation of the rear brake caliper. Using the spacer also means you need a longer machine screw. What worked for me was a M5-.8x25mm socket cap screw. I got mine at Fastenal since no one else in my area had something suitable. If you don't have a Fastenal store in your area you can go on-line with them or use McMaster.
- I also have a case/cover on order for the controller to get hit extra protection. There may be other and better solutions but this is the one I found: https://fasteddies3dsolutions.myshopify.com/ I obviously cannot give a review on it as I've not yet received it.
- You do have to pedal just a little in order to get any assist or throttle response. I do think this is sub-optimal but for me it is just not a big issue. A retrofit kit might become available to change the requirement for pedaling but I don't think one is available quite yet.