All the buyers should have experience to install it. If not, please do not buy it. 1.Can I install the kit on my 18 speed/24 speed bike? Yes, you can. But it is more difficult to install. This kit is designed for normal bike, not for the bike that can shift gears. However, you can install the kit on the left hand side if your bike is18speed/24speed… you need to mount the freewheel on the left hand side on your rear wheel axis, and spot weld to secure it. After you have installed the kit , you can still shift gears on your bike. But if you don’t know how to weld, we recommend you to buy our hub motor kit or our “mid-mounted” kit . 2.What battery is recommended for this kit? This kit is 24V, you need two 12V batteries, (lead acid or lithium), or one 24V battery.After they are linked together, the recommended capacity >12AH 3.Is the kit include batteries? No, the kit includes all the parts you need except batteries to convert the bike into electric bike.You need to buy the batteries by yourself. 4.Is the kit include a English user manual? Yes,we will send the English user manual by email. The kit includes: 1. 1x 24V 250W rare earth DC motor 2. 1x Chain 3. 1x Freewheel 4. 1x Freewheel adapter 5. 1x Motor controller 6. 1x Mounting plate + bolts 7. 1x Throttle handle & brake lever 8. 1x Detailed user manual 9. 1x Headlight ( include battery indicator and horn ) 10. 1x Switch & key 11. 1x 18cm axis Note: this kit without battery and battery charger . This bike kit is suitable for 20″-28″bike 250W ‘s max. speed :25-30km/h We have the upgrade kit is better quality than this kit,LINK : http://www.amazon.de/dp/B01IQMCBF0 promotion of shipment： We will send by DHL.or UPS or TNT.