Changing Front Chainring

[sarasotabill]

I have a Narrak E-Bike with a 40T front chainring. It is causing ghost peddling in when I am in PAS 2 and above and in 7th gear. I want to go to a 48T gear. Does anyone know if it is possible to change the chainring without removing the crank and if so, which chainring do I need to purchase. Any help would be greatly appreciated.

Bill

 

[gromike]

I would just assume you would need to pull the crank, but maybe not. As it's a hub drive it shouldn't be a problem to change the chainring, and neither is removing the crank with the proper tool. You can try to remove the chainring as it sits.
Best to post pictures focused on the area of your concern. (btw: crank pullers aren't expensive.)

 

[Jeremy McCreary]

I have a Narrak E-Bike with a 40T front chainring. It is causing ghost peddling in when I am in PAS 2 and above and in 7th gear. I want to go to a 48T gear. Does anyone know if it is possible to change the chainring without removing the crank and if so, which chainring do I need to purchase. Any help would be greatly appreciated.

Bill

I've changed chainrings on 2 different bikes — one mid-drive, one hub-drive — and didn't have to touch the cranks. But I did have to match the bolt patterns on number of bolts and BCD (bolt circle diameter).

In your case, the clearances involved may limit max chainring size.

How about some photos to help us help you? There's a 2MB limit on file size.

 

[sarasotabill]

Sorry it has taken so long to get back to you all, but life has got in the way again. I discovered that the chainring is part of the crank. Sucks. So I have a new 170mm crank set ordered with a 52T Chainring. That will be a big jump, but I usually start in 5th gear and Pass 1, so I figure now I can use the lower gears. Florida where I live is flat. The biggest hills I have are ant hills. As of today, cranks are pulled and just waiting on the new ones to arrive on Friday. Will try and keep you posted. Thanks for being patient. Bill

 

[Stefan Mikes]

I wonder if such a big chainring would even fit your frame.

 

[sarasotabill]

Stefan, I don't see why it shouldn't, but I will find out tomorrow. This is a stock picture of the bike below.

Bill

 

[Stefan Mikes]

Stefan, I don't see why it shouldn't, but I will find out tomorrow. This is a stock picture of the bike below.

Bill
View attachment 206240

You might indeed not experience any issue. In many bikes, it is the chainstay that limits the chainring size. In yours, the chainstay terminates very early (behind the battery) which should give a generous clearance.

 

[sarasotabill]

I hope you are right. I’m just waiting on Amazon to make the delivery tomorrow. I haven’t worked on bicycles since my boys raced BMX 40+ years ago. That makes me really old.