Rover want lower granny gear, 7 to 9 speed?

[jv34]

Wanting lower gearing on a 2022 Rover. Has anybody changed there drivetrain from a 7 speed to a 9 or 11 speed. If yes what was involved. I have done this with some downhill bikes but not ebikes with hub motor.

 

[AHicks]

Hub motor shouldn't make things much different. How big a gear are you thinking of?

 

[teskow]

A smaller chain ring will help to lower the ratio .

 

[jv34]

A smaller chain ring will help to lower the ratio .

Thanks teskow, this would be the cheapest fix…

 

[PedalUma]

I am pretty sure the Rover uses a screw-on freewheel. You can get ones that are 7-sp, 11-34t. It would take a longer chain. 9-11 speeds are freehub cassettes, not compatible with freewheels. You don't need a greater number of gears, just a greater range of gears, particularly on the low end. The Rover may have a 13-28 freewheel. You would need to count the cog teeth of the smallest gear and the tallest gear. You will likely require a long cage derailleur to hit the tall, granny gear. Good generics cost about $25.

I just installed a 9-43 tooth cassette that has splines and screws on. It is a different animal called an XD drive.

 

[JTK77]

I'm using 8 speed 11-42t cassette but upgraded modified G062.1000.DC motor. Chainring is 58t.

 

[jv34]

At the moment I’m running a 11-34 freewheel 7 speed with a 42T chain ring…just need the lowering gearing for those very steep single track’s….has anybody just changed the freewheel to a 11-36 or? 11-38? if yes how is it working for you?
Has anybody changed there front chainring to a 38T? And how is that working out?

 

[PedalUma]

I will sometimes use a 36-t narrow/wide chainring to step-down gearing. I do not know of any 11-36 or 11-38 freewheels. For the ring, you need to order based on BCD.

Wolf Tooth - How to measure Bolt Circle Diameter (BCD)

Bolt Circle Diameter (BCD) is the diameter of the circle that goes through the center of all of the bolts on your chainring. On bicycle chainrings this dimension is usually measured in millimeters. It is critical to know the BCD of your crankset when you are selecting a new chainring for your bike.

www.wolftoothcomponents.com

 

[PedalUma]

I will sometimes use a 36-t narrow/wide chainring to step-down gearing. I do not know of any 11-36 or 11-38 freewheels. For the ring, you need to order based on BCD.

Wolf Tooth - How to measure Bolt Circle Diameter (BCD)

Bolt Circle Diameter (BCD) is the diameter of the circle that goes through the center of all of the bolts on your chainring. On bicycle chainrings this dimension is usually measured in millimeters. It is critical to know the BCD of your crankset when you are selecting a new chainring for your bike.

www.wolftoothcomponents.com

 

[jv34]

I will sometimes use a 36-t narrow/wide chainring to step-down gearing. I do not know of any 11-36 or 11-38 freewheels. For the ring, you need to order based on BCD.

Wolf Tooth - How to measure Bolt Circle Diameter (BCD)

Bolt Circle Diameter (BCD) is the diameter of the circle that goes through the center of all of the bolts on your chainring. On bicycle chainrings this dimension is usually measured in millimeters. It is critical to know the BCD of your crankset when you are selecting a new chainring for your bike.

www.wolftoothcomponents.com

Thanks for all the information.