Carbon.
Members
-
Joined
-
Last visited
Everything posted by Carbon.
-
-
-
-
-
-
Thanks everyone for replies. When we focus too much on details noone will be able to do a rough comparison. Wheel size, tyre/tube weight, diameter of hub have an influence on moment of interia, this is obvious. But this what I have seen so far is that the biggest factor comes from hub resistance. On my movie, wheel was 26" (bare weighs 2,9kg (rim, hub, spokes) + tyre 950g + tube 130g) and was accelerated till ca. 28km/h. Ok when we compare standard solutions - not extra light extra components or dedicated for fat bike - these results can be more useful. We can set four categories of freewheeling: 1. 5-9 sec. 2. 10-20sec. 3. 20-30 sec. 4. 30+ sec. For a comperison I put this movie which I found on YT. 2'36"
-
Good day, I would like to suggest a topic in which we could compare our hubs freewheeling time. Freewheel time means that you raise up your wheel, accelerate it max (using e.g. a thumb throttle) and let it spin till stop, results is given in seconds. This is quite interesting while comparing rolling resistance. I attached the movie which shows it. Front hub AKM Q100SX from Pro swytch set 2021. Freewheel time is about 19 second. I tested also a Xiongda ytw-06 old production model 2019, had 5-9 sec, new model should be better as manufacturer promised but I haven't tested it so far.
-
Have you solved the problem?
-
Thank you. Is there anyone who can check their free-wheeling time and e.g. record a movie? It can be also other model of hub. I measure free-wheeling time with raised wheel after max it's acceleration. Results were between 10-25 sec usually. It is also am important factor by using electric kit particularly when you want/have to go without power .
-
Hello, I would like to convert second bike to an e-bike. I am looking for a small, light, with lowest resistance front or rear hub. Once I had and tested front Xiongda 1,5 kg but high resistance and then AKM Q100 2,1 kg which was quite good (low resistance - freewheel 25-30 sec) but it could be lighter. In the meantime I noticed Bafang H600 (rear, 2kg, 30Nm), but I have no experience with it. The problem with Bafang is poor sales network. I can't find any place where it is selling. What else you can recommend? My priorities are: - low rolling resistance, -low weight. It would be for a light person, so 200-250W is enough. What you can recommend more? If you know a good store, also please share it .
-
I was eager to buy their kit but I also haven't received any response. It didn't look good (particularly before purchasing) so I decided not to buy it. Contact stopped immediately some times ago.
-
Yes, the advantage of Xiongda is its small size. BTW I found also a video with similar dimensions front hub (there is no more details), please take a look just to compare. (I think that free rolling is more than dozen seconds, starts 2'36'') ------------------------------------------------------------------- This is a Xiongda plug (9 pin), so would it be possible to connect to other current front hub model like eg Q75, Q85, Q100, Mxus XF07, XF08?
-
-
-
The hub in the 1st gen Swytch is probably Xiongda YTW-06, I found its efficiency diagrams: So it looks quite good. The efficiency is on the level of 83%. What do you think about it? The rolling resistance without power is not included in this diagram, but It is confirmed that freewheel should be 6-9 sec.
-
-
-
-
Ok, thanks for answer. It is good to know. I thought that only a plug/ number of pins determined if it could work good or not. Maybe is there anyone who tried do it? Btw I can't see available front AKM 85SX in the Internet if I would consider replacing it. How many kilometres have you done on both sets? Have you met any problem with them?
-
Yes, I described this issue to Swytch. First reply was "Due to non-disclosure agreements with our suppliers, we are unable to reveal those exact details" I replied that there was nothing "top secret" in my question - just to confirm if everything worked good. Now I am waiting for a clear statement. Generally I was surprised this situation (big rolling resistance) a bit because in marketing materials was said "no friction". BTW Have you check year of build of your set? My is probably 2019 (I'm checking it with Swytch)? It could have been some changes during this period. Is your AKM plug fits to Xiongda motor? Just to know if it is exchangeable. So maybe is the any Swytch member in this forum who could make the situation more clear and just to talk about it? Best regards.
-
Thank for your point of view. The delay during peddaling is relatively low. About the number of pins, I'll check it and uptade. Regarding the weight, Xiongda is 1,5kg but AKM 85sx also is 1,5 kg. I am thinking of the efficiency. Now the front hub motors have max pick 80%. I also saw more detailed diagrams which manufactures shared. Maybe someone has more details which could compared them?
-
Dear vfr400, Thank you for answer. What models have you had in your bikes? What about adventsges and disadvantages in comparison to the Xiongda? Which is your favourite? During normal operation it looks fine but I haven't had occasion to compare it to other hubs. I'll check it as soon as I can.
-
Good Day Everyone, In this topic I would like to compare your front hub rolling resistance to verify if there is any issue in my case. I purchased the Swytch Kit (1 st gen), before this I asked Swytch if there were any differences between 1st and 2nd generation (excluded battery), below the reply: "The 2nd gen has no differences for the 100SX hub. Their was a revision of the 85SX hub during the 1st gen kit." 85SX, 100SX comes from Aikema manufacturer but I received the wheel with Xiongda hub motor. In my option its rolling resistance is too big - the wheel stops from 28km/h to 0km/h in about 5 sec. Please look at the movie => https://www.youtube.com/watch?v=3AGWBw3mxDo How it is in your case? What brand front hub you have? Could you possibly do similar test? ---------------------------------------------------------------- Just to compare, please look at the other video from YT Thank you for help.
-
Good Day Everyone, In this topic I would like to compare your front hub rolling resistance to verify if there is any issue in my case. I purchased the Swytch Kit (1 st gen), before this I asked Swytch if there were any differences between 1st and 2nd generation (excluded battery), below the reply: "The 2nd gen has no differences for the 100SX hub. Their was a revision of the 85SX hub during the 1st gen kit." 85SX, 100SX comes from Aikema manufacturer but I received the wheel with Xiongda hub motor. In my option its rolling resistance is too big - the wheel stops from 28km/h to 0km/h in about 5 sec. Please look at the movie => https://www.youtube.com/watch?v=3AGWBw3mxDo How it is in your case? What brand front hub you have? Could you possibly do similar test? ---------------------------------------------------------------- Just to compare, please look at the other video from YT Thank you for help.
