Joy Kie 26-Inch: 13 Ah Is Not 11.6 Ah

The Joy Kie 26-inch fat-tire bike on the page this desk opened is model ROCKM006, trademark ROCKSHARK, sold by Joy Kie Corporation as a wholesale listing. The price line is US$560 to $650, and the minimum order is five pieces. That is a factory band, not a bike-shop checkout. The tire is 26 by 4.0. The motor line, in the bullet and in the table, is a 500-watt, 48-volt rear hub. The controller line is 48 volts and 20 amps. Forty-eight times 20 is 960 watts. The page calls the motor 500. It does not call 960 the motor. Nine hundred sixty divided by 500 is 1.92, so the controller arithmetic is almost twice the motor sentence. Do not publish one of them as the other.

13 amp-hours is not 11.6

The marketing bullet says a 48-volt, 13-amp-hour removable pack. Forty-eight times 13 is 624 watt-hours. The specification table says a 48-volt, 11.6-amp-hour lithium pack and names LG cells. Forty-eight times 11.6 is 556.8 watt-hours. Six hundred twenty-four minus 556.8 is 67.2 watt-hours. Thirteen divided by 11.6 is 1.12, so the bullet is 12 percent more amp-hours than the table. The LG name is on the 11.6 line only. It is not on the 13-amp-hour bullet. The watt-hour page is the multiplication. The battery page is why a cell brand on one line does not move to the other pack. This desk will not average 13 and 11.6 into 12.3.

Twenty-five, twenty-one, and thirty miles an hour are three sentences. A 20-to-40 km/h band is a fourth. They do not become one top speed.

25 mph, 21 mph, and 30 mph

One sentence says 25 mph by pedal and 21 mph by throttle. The next block says five levels of assistance to 30 mph. The attribute list says a max speed of 20 to 40 km/h. Twenty-five miles an hour is 40.2 km/h. Twenty-one is 33.8 km/h. Thirty is 48.3 km/h. Forty kilometers an hour is 24.9 mph, and 20 km/h is 12.4 mph. The 21 mph throttle sits inside the 20-to-40 km/h band. The 30 mph sentence does not. The 25 mph pedal line is the top of that band, rounded. A throttle past 20 mph is not Class 2. Class 3 can assist to 28 mph and does not get a throttle. Thirty is past 28. Five hundred watts is under 750, and the bike has pedals, and that is not enough. The class chart is the test. The page also lists CE, EN15194, and UL 2849. EN15194 is a European pedelec rule, 250 watts and 25 km/h. Twenty-five kilometers an hour is 15.5 mph. Five hundred watts is not 250. Twenty-five miles an hour is not 25 kilometers an hour. UL 2849 is an electrical-system mark. It does not add a class. This desk did not see the certificates.

The miles are a range, not a test

One paragraph says about 26 to 40 miles on the throttle and 30 to 50 miles on pedal assist. A second line on the same page says 30 to 40 miles on the throttle and 30 to 50 on the pedals. The pedal pair matches. The throttle floor does not: 26 and 30 are both printed. Fifty miles on 624 watt-hours is 12.5 watt-hours a mile. Thirty miles on 624 is 20.8. Fifty miles on 556.8 watt-hours is 11.1 watt-hours a mile. Thirty on 556.8 is 18.6. A 26-by-4.0 tire at 11 watt-hours a mile is the gentle end of a claim, and the page does not say which pack those miles used, or the rider’s weight, or the assist level. The attribute list also says a range of 10 to 30 km, which is 6.2 to 18.6 miles. That band does not contain 50 miles. The range page is why a pair of miles is not a loop. The tire page is why 26 by 4.0 is a fat tire, and why a soft fat tire spends more than a slick.

A 2024 owner thread is a different Joy Kie. The sticker was ROCKM007, a 350-watt, 36-volt bike, bought for $450 plus shipping, not this ROCKM006. His listing used the same 30-to-50 and 26-to-40 mile sentences, and he wrote that he saw about 20 to 30 miles on assist and 10 to 20 on the throttle. That is his bike. It is evidence the sentences are a template. It is not a test of the 11.6-amp-hour pack. No public ride video of the ROCKM006 turned up. Joy Kie’s own channel posts factory clips. None of them is labeled as this 26-inch fat-tire bike, so none of them is embedded here.

A 19-inch frame, and a fork with no travel

The page says a 19-inch frame suits a rider from 6 feet to 6 feet 6 inches. Six feet is the short end of that sentence. A rider at 5 feet 10 is not in it. The fork line is 28.6 by 25.4 by 265 mm, and the word suspension. Two hundred sixty-five millimeters is a tube length in that triple. It is not travel. The mountain guide is why a fork with no travel in millimeters is not a 170 mm bike. Gears are a Shimano 7-speed and a 14-28 freewheel. Twenty-eight divided by 14 is 2, a 200 percent range. That is a small cassette behind a fat tire. Brakes are discs, with no rotor size. The motor is a rear hub, so it does not use those seven gears the way a mid-drive would. The bullet says the motor is “IP5.” An IP code has two digits. IP5 is not a finished rating. No weight is printed. No charger amp is printed. An Alibaba filter on a Joykie 26-inch listing says 50 to 60 newton-meters. The Made-in-China table does not. A hub newton-meter, if it were printed, would be at the axle. The motor page is why 500 watts and 960 watts of controller arithmetic are not torque.

Who it is for

This is a wholesale sheet, not a bike you add to a cart as one. Read it if you are comparing a 26-by-4.0, 500-watt hub bike and you need the two packs kept apart: 624 watt-hours in the bullet, 556.8 in the table. Skip it if you needed a Class 2, a printed weight, a rotor size, or a range someone rode. Five hundred watts and a throttle to 21 mph already fail the class test, before the 30 mph sentence. This desk did not ride it.