What is the difference between bafang bbs02b and bbshd?
If you are looking into building your first DIY e-bike, you will probably find that a lot of builders are using the Bafang mid-drive motor conversion kit. You might wonder: “why are so many people using this kit?” and “is it really that good?”. "how to choose thr right motor". In this review, I will give the answers to all these questions.
1.From Production Time
The BAFANG BBS02 was first released in 2014 with the "A" version of the controller MOSFET, which could not support higher currents and was prone to overheating, which caused many motors to fail prematurely. To better address this issue, "B" version was released in 2016. This (supposedly) has a better controller and a higher quality "brand" IRFB3077 FET, which converts more input watts into power and less input watts into waste heat.
The Bafang BBSHD was launched in 2016, and the main difference between the two motors is that the HD is larger and has external heatsinks (to help dissipate heat). The stator is 66% larger and the controller has 12 IRFB3077 FETs that can handle 30A of continuous current. The input voltage is the same as the BBS02.
2.From Installation
The BBS02 only comes in a single bottom bracket size. It can fit in bottom brackets that are 68mm and 73mm wide. It fits a standard threaded 68 or 73mm bottom bracket. If you have a press-fit bottom bracket of this width, we have adapters that can convert your bottom bracket to the threaded standard so the BBS02 can fit. If you have a wider bottom bracket, you will need to use either the Bafang BBSHD or CYC X1 Pro.
In addition to the 68/73mm bottom bracket sizes that the BBS02 fits, the BBSHD also comes in a 100mm and 120mm BB width. These are typically used exclusively on fat bikes. The BBSHD is always an excellent choice for a fat bike because they are heavier and often used in sand, snow, or steep terrain. However, The 100mm also bridges the gap down to 83-92mm bottom brackets. These are popular BB widths for high-end mountain bikes. To fit the BBSHD, these typically require press-fit adapters and 8-16mm of bottom bracket spacers, and these conversions are solid. When possible, the spacers should go on the non-drive side to help equalize the Q-factor. Exceptions are when some spacing is necessary on the drive side so that the “gear reduction housing” clears the right chain stay.
Carbon frames often cannot accommodate a Bafang mid-drive motor because the bottom bracket shell casing is too thick. Bafang mid-drive motors have a 12mm clearance between the motor housing and the spindle. Most carbon frames have a BB shell casing thicker than this, and the motor won’t slide into the bottom bracket. The newer design of the CYC motors eliminates this problem.
3.From Power
As shown in the record table in the picture, the BBSHD produces more power than the BBS02 at the same battery voltage, although there is only a 294 watt difference (if using a 52v battery), the big difference in the feel of the HD is the amount of torque it produces. This is up to 160N.m against 120N.m for the 750w.The bigger motor spins faster – 130-150 rpm (120 rpm for the 750w) and has a reduction ratio of 1:21.9.
So the BBSHD is much larger than the bbs02, and the BBSHD is 3 pounds heavier than the bbs02, the BBSHD uses more powerful components and a more powerful controller.
4.From Price
If you want an off-road electric bike that you can hammer the hell out of, then I would definitely say go for the BBSHD. The extra 272USD on the price may seem a little excessive, but it will give you over any steep incline, Cross any terrain and conquer all impossible paths
If you are going to be doing some mild cross country-type riding and are not going to be using the throttle or tackling any ridiculously steep climbs then the BBS02 may be more suited to your needs.
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