Replace Cog on Shimano Single Speed Freewheel

[Kelly Black]

Hello,

I have a single speed, shimano freewheel on a flip/flop hub. I would
like to have a bigger cog on the freewheel to lower the gearing (too
many hills here!). As far as I can tell my only choice is to buy a
whole new freewheel. The problem is that the shimano freewheel only
comes in three sizes, and the other options cost big bucks (like $90 -
yikees).

Is it possible to remove the cog on the shimano 3/32" freewheel and
replace it with a bigger cog? Any points on how to do this would be
appreciated.

(I only want to change the gearing a little bit and was hoping to leave
the chainring alone.)

Thanks in advance,
Kel

 

[M-gineering]

Kelly Black wrote:
> Hello,
>

>
> Is it possible to remove the cog on the shimano 3/32" freewheel and
> replace it with a bigger cog? Any points on how to do this would be
> appreciated.
>

no, unless you fancy welding.

Other brands than shimano will have more (and bigger) sizes. AFAIK
Shimano only does 16 & 18

--
---
Marten Gerritsen

INFOapestaartjeM-GINEERINGpuntNL
www.m-gineering.nl

 

[landotter]

Kelly Black wrote:
> Hello,
>
> I have a single speed, shimano freewheel on a flip/flop hub. I would
> like to have a bigger cog on the freewheel to lower the gearing (too
> many hills here!). As far as I can tell my only choice is to buy a
> whole new freewheel. The problem is that the shimano freewheel only
> comes in three sizes, and the other options cost big bucks (like $90 -
> yikees).
>
> Is it possible to remove the cog on the shimano 3/32" freewheel and
> replace it with a bigger cog? Any points on how to do this would be
> appreciated.

No. But you can just get a new freewheel. They're not expensive, $10-20
for something basic by Shimano or ACS.

 

[JeffWills]

M-gineering wrote:
>
> Other brands than shimano will have more (and bigger) sizes. AFAIK
> Shimano only does 16 & 18
>

And 17t:
http://sheldonbrown.com/harris/singlespeed.html#freewheels

ACS makes 20 and 22 tooth, along with a 16, 17, and 18-tooth:
http://harriscyclery.net/page.cfm?PageID=49&action=list&Category=292&Brand=7&type=T
(the 14 and 15 tooth fit the smaller "metric" thread on a BMX flip-flop
hub)

Jeff

 

[black]

Thanks to everyone who replied. I was afraid that I just have to get a
new freewheel. The ACS freewheel looks fairly inexpensive so that looks
like the way to go. I really didn't want to spend $90 on a freewheel
that I would just grind up over the first winter.


JeffWills wrote:
> M-gineering wrote:
> >
> > Other brands than shimano will have more (and bigger) sizes. AFAIK
> > Shimano only does 16 & 18
> >
>
> And 17t:
> http://sheldonbrown.com/harris/singlespeed.html#freewheels
>
> ACS makes 20 and 22 tooth, along with a 16, 17, and 18-tooth:
> http://harriscyclery.net/page.cfm?PageID=49&action=list&Category=292&Brand=7&type=T
> (the 14 and 15 tooth fit the smaller "metric" thread on a BMX flip-flop
> hub)
>
> Jeff