All the buyers should have experience to install it. If not, please do not buy it. 1.This kit is not suitable for any bike, contact us before you purchase it. 1.This kit is not suitable for any bike, contact us before you purchase it. 1.This kit is not suitable for any bike, contact us before you purchase it. please see the pictures carefully, or contact us before you purchase the kit. you can send the pictures of your rear wheel to us, both left side and right side, we can give you some suggestions. 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,please contact us when you receive the kit. 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 manual9. 1x Switch & key10. 1x 18cm axis Note: this kit without charger . This bike kit is suitable for 20"-28"bike