Bosch Front Sprocket change

[Trekkie]

Hi All, I want to change the front sprocket on my Trek Powerfly to 20T and wondered if all front sprockets are created equal or are there some that are better than others? I have seen some FSA ones which is a brand i recognise, wondered if anyone had any experience good or bad on what is out there. Also the same question for the sprocket tool.

Thanks

Roger

 

[soundwave]

fsa connex or Miranda will all be fine unless you need an off set one or the haibike ones at 90 quid.

 

[Gadfly]

+1 for the Connex.

 

[soundwave]

http://www.pedelecs.co.uk/forum/threads/bosch-20t-offset-2-5mm-£14-99.32335/

 

[Trekkie]

Thanks all, I have ordered the FSA one and a spider tool.

 

[DroidOne]

I have a Bosch Active Plus bike with a 38T front sprocket, coupled with a Shimano HG500, 11-42, 10-speed.

30 kph equals about ~70 rpm. I can easily get the bike to 30 kph, but would be way more comfortable @ 60 rpm. Keeping 70-75 rpm for a longer period isn't very comfortable.

Should I go for a 44T or a 46T sprocket? Would a 46T sprocket fit? There's a 20% difference between 46T and 38T.

There's barely any hills where I live, so I never go below 7, and most of the time just switch between 9 and 10.