Where to Find and Actually Use the Aurelia B20 Owner's Manual
The Aurelia B20 owner's manual is a 64-page PDF that covers assembly, battery maintenance, firmware updates, and troubleshooting. It sits on the Aurelia support site, buried under three clicks from their homepage. The direct URL keeps changing, so searching for "Aurelia B20 manual PDF" usually lands you somewhere useful. I've been working with these units for about four years now. The manual itself is decent but honestly not well organized. Section 4 on battery care runs counter to what the quick-start card says, which confused me for a long time. The actual charging limits are 5 to 95 percent for daily use, not 10 to 90 like the booklet suggests. I found this out by monitoring cycle counts on a fleet of twelve bikes over eighteen months. The manual was written before they adjusted the BMS firmware in the spring of 2024. Here is the practical breakdown of what matters in that document.
Assembly and setup. Pages 8 through 14 cover frame assembly. The torque specs for the stem bolts are listed as 15 Newton meters. That is correct. What the manual leaves out is the fact that the handlebar clamp uses a proprietary bolt pattern. Standard Allen keys strip the heads easily. You need the Torx T25 driver that comes in the tool kit. I stripped three bolts on my first build before figuring that out. Used thread locker after that. No issues since. Battery removal and installation. The release latch is on page 19. It looks simple but people force it. The latch has a secondary safety clip you have to press down while pulling the handle. If you pull without pressing the clip, you will crack the housing. I replaced about six of those per month during my first year. Once I told riders the two-step motion, returns dropped to almost nothing. Firmware update process. This is where the manual actually helps the least. Pages 31 to 35 describe using the Aurelia app to update. The real catch is that the bike must be connected to Wi-Fi, not just Bluetooth. The app will try to push updates over Bluetooth and fail silently. The error message says "connection lost" even when the bike is fine. You have to enable 2.4 gigahertz Wi-Fi on your phone, connect the bike to your network, then trigger the update. Takes about eight minutes. I wrote a one-page cheat sheet for my service desk that replaced the manual sections entirely.
Common failure modes. The manual lists seventeen error codes. Three of them are basically noise from outdated firmware. Error 12, which the book calls a motor controller fault, is almost always a loose phase wire at the hub. I opened about forty motors chasing that code and found the same thing every time. Error 23, listed as a display communication failure, is the ribbon cable between the LCD and the main board. Reseating it fixes it. The manual suggests replacing the entire display unit, which runs about eighty dollars. Not necessary in most cases. Winter storage. Pages 52 to 55 cover seasonal storage. They recommend storing the battery at 50 percent charge. That is wrong for the B20's specific cell chemistry. Storing below 60 percent in cold conditions causes irreversible capacity loss. Keep it between 60 and 70 percent. Store at room temperature if possible. The manual was updated in the 2025 revision to reflect this, but a lot of people are still reading older copies. Tire pressure and load limits. The max load is listed as 265 pounds. Realistically, the frame holds that fine but the saddle and stem start showing stress at around 230. I have replaced saddles on frames that were clearly under the weight limit because the rider was bouncing on them hard. Check the saddle bolt torque every three thousand miles. It drops below spec faster than you would think.
Get the Full Details
The full Aurelia B20 Owners Manual can be downloaded from the official Aurelia support page. If the link on their site is broken, try the archive at manuals.aurelia-support.com. There is also a printed copy available for about fifteen dollars from their parts counter, which some people prefer because the PDF is hard to read on a phone screen. One more thing the manual does not mention: the brake pad wear indicators on the B20 are not visual. You have to listen for a high-pitched squeal that starts around 1.5 millimeters of pad remaining. The pads last roughly eight to ten thousand miles depending on riding style. I track this with a simple caliper measurement logged in the service database. Replacing them takes about twenty minutes. The manual estimates forty-five. They oversell the labor time, probably to push people toward professional service. If you are building a fleet or managing multiple units, the manual is a starting point but not enough. The firmware update quirk alone will waste hours of your time if you do not know about it. The battery storage guidance is outdated on older prints. And the error codes need contextual interpretation. I keep a laminated one-page reference at every service station that covers the real-world fixes. The full manual stays on the shelf for reference, not as a daily guide.
