The SW102 and the ERv2 are identical displays with different firmware inside. They are made by a common manufacturer. Want to see a third version?
Check out the KT-LCD4. I bought one, then two more to replace all of my KT displays. Unlike the big displays these only cost between $25 and $35 depending on whether you want to wait for one on AliExpress or get it tomorrow on Amazon. Exactly the same casing but KT specified a change that everyone should have gone for. A backlit LCD display that is visible in the brightest sunlight and the darkest night. The OLED displays of the DM03 and the ERv2 (I have both) can't hold a candle to this.
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I tried the Hangzhou Velofox DM03 which advertises as an upgrade to the SW102, supporting 9 levels of PAS. However I had two separate DM03's wig out on me with PAS set to 9 and both had to be set down to 5 levels to keep working right (each functioned properly for about a week and then both went haywire in the same way). This was my 2wd Bullitt when I was using the DM03 on the left and the LCD4 on the right. WAY cleaner handlebar setup and I have changed over all the bikes I ride regularly to use these minimalist displays.
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But with the DM03 being almost invisible in bright sunlight, and incapable of supporting the advertised 9 levels of PAS (I did side by side tests with an 860C and it was definitely a problem in the displays, which were manufactured several months apart and had different version numbers on their labels) I tried out the cheapest, smallest, most minimalist display on the market. It too is OLED but its display is so large (big speed numbers only) you can see it at noon on a sunny day. The
Jiande Wuxing DZ40 that costs a whole $29.97. Here is the same bike with the DM04 replaced with it. I switched sides on the LCD4 because the DZ40 gives me more room to fully clear the shifters.
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The DZ40 is the best BBSHD display for me. Before I was married to the 860C because it is brightest in sunlight could show amps and watt output in real time, but once you get a handle on that behavior, its just clutter. All I care about is the numeric voltage the LCD4 gives me, and - out of curiosity only - the speed the DZ40 shows.
I've had sort of an epiphany when it comes to displays and what is actually preferable. In particular learning that 5 levels of PAS is better than 9. At some point soon I'm doing an article comparing displays.
The BN136 is another little display I put on my Apostate emtb, and it seems to be a great compromise between tiny and legible. Bigger than the little ones above but still less than half the size of the standard ones. Even smaller than the 500C.
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