Just what I was looking for.

[OxygenJames]

Ok so for those keeping up with the story the 44T front 14 rear on the Burisch was hopelessly too low geared so I tried upping it first to 48 then 50T at the front but even thats not much good.........

So then I think OK so I need a smaller rear cog top gear - 14T is just too big. BUT - and its a big BUT - you try finding a 6 speed freewheel cassette with say a 12 or an 11T - they dont exist. Well I found one 12 but it lwas from a country I had not even heard of.

So then I think OK how about a 7 speed - and low and behold I finally found one - it has an 11T top gear - on USA ebay and I found its no problem buying things off USA Ebay if you have a paypal account so I ordered it: 7-speed 11-28 freewheel

So now all I have to do is convert the whole thing over to 7 speed from 6 speed (I think there's just about enough room for it to fit) - and perhaps I will have a bike where the cadence in top is more like 60 and less like 80.

Ah the joy's of buying what you think you want and then making it become exactly what you want.

 

[Biker44]

Ok so for those keeping up with the story the 44T front 14 rear on the Burisch was hopelessly too low geared so I tried upping it first to 48 then 50T at the front but even thats not much good......... So then I think OK so I need a smaller rear cog top gear - 14T is just too big

Teeth on a motorcycle front sprocket were always an odd number and the minimum was 13.

Disappointed to hear that the jump from 44 to 50 teeth at the front wasn't very good. I have a 46 tooth, obviously I can't expect much improvement.

 

[Scimitar]

I was looking for exactly that, last year. I found some 11T ones all right, but there would have been a problem with space - not enough. The 11T was outside the normal and was, in effect, an add-on to the cluster. I wondered if a cluster could be made from scratch as a 3 or 5 speed, but from what I recall, there was a problem of the inner diam of the 11T being too small to fit on the body of the cluster, so it would still be hanging off the end.
I fitted a 52 front, which worked well, but the chain kept leaping off on bumps, so that went back in the bits box until I can have another go at that. I really need a longer chain for that anyway.

 

[Cyclezee]

So then I think OK how about a 7 speed - and low and behold I finally found one - it has an 11T top gear - on USA ebay and I found its no problem buying things off USA Ebay if you have a paypal account so I ordered it: 7-speed 11-28 freewheel

So now all I have to do is convert the whole thing over to 7 speed from 6 speed (I think there's just about enough room for it to fit) - and perhaps I will have a bike where the cadence in top is more like 60 and less like 80.

Ah the joy's of buying what you think you want and then making it become exactly what you want.

Hi OxygenJames,

Sorry if this is a bit late, but we stock the same Freewheel here in the UK.
You can find it on our shop page Shop - electric bikes and conversion kits for £25 including delivery.

 

[OxygenJames]

Hi OxygenJames,

Sorry if this is a bit late, but we stock the same Freewheel here in the UK.
You can find it on our shop page Shop - electric bikes and conversion kits for £25 including delivery.

Yes that is a shame - I searched high and low on the net but only that place in the US showed up. Ah well. You live and you learn I should have asked here first eh?

 

[Mussels]

Not all seven speed freewheels are the same so check what shifters you need, maybe John can help there?

 

[OxygenJames]

Not all seven speed freewheels are the same so check what shifters you need, maybe John can help there?

Thanks. It says its Shimano compatible so I am taking pot luck I guess. As in I am planning to use this: Shimano Thumb Shifters Tx50 7SPD as the gear changer.

One other thing - some people say I will need to put a new chain on as the 6 speed cassette and 7 speed as so different - me I'm thinking it cant be that much slimmer on the 7-speed - any thoughts anybody?

 

[Mussels]

Thanks. It says its Shimano compatible so I am taking pot luck I guess. As in I am planning to use this: Shimano Thumb Shifters Tx50 7SPD as the gear changer.

One other thing - some people say I will need to put a new chain on as the 6 speed cassette and 7 speed as so different - me I'm thinking it cant be that much slimmer on the 7-speed - any thoughts anybody?

I don't know if the size is different but I'd fit a new chain anyway, a worn one could wear your new freewheel prematurely.

 

[oigoi]

Thanks. It says its Shimano compatible so I am taking pot luck I guess. As in I am planning to use this: Shimano Thumb Shifters Tx50 7SPD as the gear changer.

One other thing - some people say I will need to put a new chain on as the 6 speed cassette and 7 speed as so different - me I'm thinking it cant be that much slimmer on the 7-speed - any thoughts anybody?

Reading here http://www.sutherlandsbicycle.com/Chapter5.pdf on page 4 it says that a 6 speed chain is 7.8mm wide and a 7 speed chain is 7.1 or 7.3mm wide.

It does say that a 7 speed chain is often used as a substitute on 6 speed systems (but it may drop between the cogs) so you might have a seven speed chain on already - maybe measure the width?

 

[geostorm]

This is another problem for anybody customizing,... what i now face by upping chain wheel size from 48t to 52t is that guard no longer fits, so ideally you should buy ring with guard fitted. as they are not accessible from shop.



Ezee Forza

 

[Biker44]

I don't know if the size is different but I'd fit a new chain anyway, a worn one could wear your new freewheel prematurely.

Worn chains always damage the larger cog!

That's because they stretch and ride up the teeth, which is a far smaller problem on the free-wheel.

 

[Mussels]

Worn chains always damage the larger cog!

That's because they stretch and ride up the teeth, which is a far smaller problem on the free-wheel.

By freewheel I'm refering to the set of cogs that screw onto the hub, as opposed to a cassette which slides onto the hub or hub gears that are encased.

 

[OxygenJames]

Reading here http://www.sutherlandsbicycle.com/Chapter5.pdf on page 4 it says that a 6 speed chain is 7.8mm wide and a 7 speed chain is 7.1 or 7.3mm wide.

It does say that a 7 speed chain is often used as a substitute on 6 speed systems (but it may drop between the cogs) so you might have a seven speed chain on already - maybe measure the width?

Thanks I'll check.

 

[OxygenJames]

Reading here http://www.sutherlandsbicycle.com/Chapter5.pdf on page 4 it says that a 6 speed chain is 7.8mm wide and a 7 speed chain is 7.1 or 7.3mm wide.

It does say that a 7 speed chain is often used as a substitute on 6 speed systems (but it may drop between the cogs) so you might have a seven speed chain on already - maybe measure the width?

OK - Wikapedia says this:
3-8 speed - 7.2mm (all brands)
9 speed - 6.8mm (all brands)
10 speed - 6.2mm (Shimano)
10 speed (narrow) - 5.9mm (Campagnolo)
11 speed - 5.5mm (Campagnolo)

Which seems to go against what you say there.

I may just try it with the chain already on and see if it makes a lot of noise and if it does then I will think about getting a thinner chain!

 

[HypnoToad]

This is another problem for anybody customizing,... what i now face by upping chain wheel size from 48t to 52t is that guard no longer fits, so ideally you should buy ring with guard fitted. as they are not accessible from shop.



Ezee Forza

I found this also, went from the standard 48t chainring to a 53t one.

The chainguard now longer fits but I didn't need it anyway, so I've removed it. I'm tempted to get a 56t chainring now, but larger ones seem harder to find.