11-29-2021, 10:59 AM | #23 | |
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But I couldn’t understand how 21” is worse then 22” wheels. 22” has larger friction (wider surface than 21) and also as per my basic knowledge, larger inch increases the consumption. |
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11-29-2021, 02:14 PM | #24 | |
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What are you basing your info on to say that the 21" wheels are worse for range than the 22"? |
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11-29-2021, 03:02 PM | #25 | |
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20” 325 miles 21” 275 miles 22” 300 miles I don’t know how the bigger 22”s have a better range, but that’s what they said… |
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11-29-2021, 03:40 PM | #26 |
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That is interesting.
Actually I have checked but couldn’t find that info. Technically, that is not possible because larger the wheel means larger in all dimensions. Basic information is that, holding all other variables constant, larger wheel has more consumption. This is applicable for all EVs and others. |
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11-29-2021, 05:36 PM | #27 |
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11-29-2021, 06:32 PM | #28 | |
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The shadowline has 0.30 of drag coefficient and the sport has a 0.25 drag coefficient . Unfortunately the “sport” doesn’t come with 20” (the best range) wheels… Just for comparison the car with the best drag coefficient at the moment is the Mercedes EQS with 0.20, followed closely by Lucid and Tesla model S @ 0.21 |
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11-30-2021, 12:52 AM | #29 |
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The range situation on the US site is a little weird. The 21" - 275 miles data, 22" - 300 miles were shown under Charging Q&A. However, when playing with the configurator from other regions that actually provides "live" range estimation (UK or Germany), the 21" always have a slightly longer range than 22".
Not sure which one to trust now. |
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11-30-2021, 11:50 AM | #30 |
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After a bit of checking, I realized that range values on BMW US and Canada sites are based on EPA, while European sites are based on WLTP.
There is also a notice on USA website saying “ The EPA and US Department of Energy estimates have not been released for the 2022 BMW iX.” As far as I know, WLTP is for European roads (more city driving) and EPA is for US roads (more freeway driving). For example, WLTP of xdrive 40 is between 246-257 miles. Whereas xdrive 50 is between 365-380 miles. |
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11-30-2021, 11:52 AM | #31 | |
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11-30-2021, 12:05 PM | #32 |
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Additionally, there are nice explanations on BMW UK website:
“ High average speeds (motorway) reduce the range most significantly, while inner-city traffic leads to a higher range due to lower speed and higher recuperation shares (in contrast to vehicles with internal combustion engines). Furthermore, the range is reduced at low temperatures due to heating, and high temperatures with strong air conditioning. The vehicle load, for example the number of passengers carried as well as the amount of luggage, as well as optional equipment fitted to a vehicle can also impact the range. The selection of larger alloy wheel and tyre sizes generally reduces the range (if the aerodynamic disadvantage is not compensated for by a more closed wheel design). The rolling resistance class of tyres is also relevant for the range: e.g. the use of a winter tyre reduces the range compared to a Label A summer tyre.” “ In the model selection, the communicated range is based on the WLTP (Worldwide harmonized Light-Duty Test Procedure) cycle. WLTP enables a calculation of the range under prescribed driving conditions. WLTP assumes a defensive driving style with a route mix of city streets, country roads and highways. The range indicator enables you to estimate the range based on the effect of three variable factors (Driving style, ambient temperature and use of air conditioning). The actual range achieved will depend on a number of other variable factors as set out in the ‘In detail’ section above. The outer circle represents the calculated range value based on linear distances (not the actual street map), while the inner circle shows the calculated value -30% to take the real-world routes into account. All range figures shown assume the battery has been fully charged.” Source: https://www.bmw.co.uk/en/all-models/...range-charging |
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11-30-2021, 03:26 PM | #33 | |
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11-30-2021, 03:41 PM | #34 | |
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In USA, all range information is given through EPA. |
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11-30-2021, 06:40 PM | #35 | |
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Maybe I'm in the weeds here, but I would challenge that figure and ask them why do the websites not show this difference when they went through the trouble of doing it for each different wheel you can get. Seems odd to me, but what do I know |
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11-30-2021, 07:28 PM | #36 |
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