http://wjdj.ch/tags/diy/Recent content in Diy on wjdjHugoen-US© 2026 wjdjFri, 31 Jul 2026 00:00:00 +0000http://wjdj.ch/posts/ebike-conversion-journey/Fri, 31 Jul 2026 00:00:00 +0000http://wjdj.ch/posts/ebike-conversion-journey/<p>I bought the bike in early 2019, and not for any considered reason. A coworker rode it into the office one day and I liked the look of it. When he moved away not long after, he asked if I wanted it, and I said yes.</p> <p>Then I barely rode it. Commuting on it never even occurred to me at the time. At some point we moved house and the bike stayed behind at my parents&rsquo;, where I mostly forgot it existed. I brought it back in mid-2023, gave it a clean, and then promptly forgot about it again.</p>http://wjdj.ch/posts/ebike/Thu, 30 Jul 2026 00:00:00 +0000http://wjdj.ch/posts/ebike/<p>This is the current state of my eBike</p> <p><img src="bike.jpg" alt="The Winora Bermuda — the base bike for this conversion"></p> <h2 id="base-bike">Base bike</h2> <table> <thead> <tr> <th>Component</th> <th>Details</th> </tr> </thead> <tbody> <tr> <td>Frame</td> <td><a href="https://winora-group.com/wp-content/uploads/2017/02/WINORA_2018_Bermuda.pdf">2018 Winora Bermuda, aluminium 6061, large (~60 cm)</a></td> </tr> <tr> <td>Fork</td> <td>SR Suntour NEX, 63 mm travel, steel spring, 1-1/8&quot; steel steerer, QR</td> </tr> <tr> <td>Bottom bracket</td> <td>Threaded shell, 68 mm width</td> </tr> </tbody> </table> <h2 id="conversion-kit">Conversion kit</h2> <table> <thead> <tr> <th>Component</th> <th>Details</th> </tr> </thead> <tbody> <tr> <td>Motor</td> <td>Bafang BBS02, 36V, mid-drive, 500W</td> </tr> <tr> <td>Battery</td> <td>36V 15Ah Hailong &ldquo;Mini&rdquo; pack (≈540Wh), ~35 cm case, downtube mount</td> </tr> <tr> <td>Display</td> <td><a href="https://eggrider.com/en/eggrider-v2/">EggRider V2</a></td> </tr> </tbody> </table> <h2 id="drivetrain">Drivetrain</h2> <table> <thead> <tr> <th>Component</th> <th>Details</th> </tr> </thead> <tbody> <tr> <td>Crankset</td> <td>Gustavo 42T chainring (BBS02)</td> </tr> <tr> <td>Rear derailleur</td> <td>Shimano Acera M360, 9-speed</td> </tr> <tr> <td>Cassette</td> <td>Shimano HG200, 12–32T</td> </tr> <tr> <td>Chain</td> <td>CN-HG53</td> </tr> <tr> <td>Shifter</td> <td>SL-M370, 9-speed</td> </tr> </tbody> </table> <h2 id="wheels--tyres">Wheels &amp; tyres</h2> <table> <thead> <tr> <th>Component</th> <th>Details</th> </tr> </thead> <tbody> <tr> <td>Rims</td> <td>X-Pert X3 alloy, double-wall</td> </tr> <tr> <td>Front hub</td> <td>Shimano Alivio dynamo T4050</td> </tr> <tr> <td>Rear hub</td> <td>Shimano TX505</td> </tr> <tr> <td>Axles</td> <td>QR — 100 mm front / 135 mm rear</td> </tr> <tr> <td>Tyres</td> <td>Schwalbe G-One Allround 28×1.50 (40-622)</td> </tr> <tr> <td>Tubes</td> <td>Schwalbe SV19 Presta, 40 mm valve</td> </tr> <tr> <td>Mudguards</td> <td>SKS Chromoplastics</td> </tr> </tbody> </table> <h2 id="cockpit">Cockpit</h2> <table> <thead> <tr> <th>Component</th> <th>Details</th> </tr> </thead> <tbody> <tr> <td>Handlebar</td> <td>Alloy Ergoriser trekking riser bar, 630 mm wide</td> </tr> <tr> <td>Stem</td> <td>Promax MQ-527, 95 mm, +10°</td> </tr> <tr> <td>Seatpost</td> <td>27.2 mm alloy</td> </tr> <tr> <td>Saddle</td> <td>Selle Royal Wave</td> </tr> </tbody> </table> <h2 id="lighting">Lighting</h2> <table> <thead> <tr> <th>Component</th> <th>Details</th> </tr> </thead> <tbody> <tr> <td>Front</td> <td>Trelock LS 592, LED, 6V/2.4W, 20 lux</td> </tr> </tbody> </table> <h2 id="geometry">Geometry</h2> <table> <thead> <tr> <th>Measurement</th> <th>Value</th> </tr> </thead> <tbody> <tr> <td>Stack</td> <td>665 mm</td> </tr> <tr> <td>Reach</td> <td>425 mm</td> </tr> <tr> <td>Stack-to-Reach</td> <td>1.56:1</td> </tr> <tr> <td>Seat tube</td> <td>600 mm</td> </tr> <tr> <td>Effective top tube</td> <td>615 mm (7° slope)</td> </tr> <tr> <td>Head tube angle</td> <td>71°</td> </tr> <tr> <td>Seat tube angle</td> <td>75°</td> </tr> <tr> <td>Head tube length</td> <td>190 mm</td> </tr> <tr> <td>BB drop / height</td> <td>65 mm / 286 mm</td> </tr> <tr> <td>Chainstay</td> <td>450 mm</td> </tr> <tr> <td>Front-center</td> <td>685 mm</td> </tr> <tr> <td>Wheelbase</td> <td>1130 mm</td> </tr> <tr> <td>Trail</td> <td>67.7 mm</td> </tr> <tr> <td>Fork offset</td> <td>50.2 mm</td> </tr> <tr> <td>Wheel flop</td> <td>20.9 mm</td> </tr> <tr> <td>Crank length</td> <td>170 mm</td> </tr> </tbody> </table> <h2 id="conversion-notes">Conversion notes</h2> <p><strong>Mid-drive vs hub:</strong> The BBS02 replaces the bottom bracket entirely, so you lose the original crankset. Mid-drives work through the bike&rsquo;s gears, giving consistent mechanical advantage across all speeds — useful for climbing and variable terrain.</p>