Alternative to Shimano SF-MX30?

father_jack

What are alternatives to Shimano SF-MX30? I would like 15T as well, as 16T is a bit too low gearing.

Is changing 3/32 single speed to 1/8" single speed a simple affair? Just change over chainring make sure I get correct BCD, chain and sprocket, chain lines will be equal, no spacers required?

With 1/8" is there more variety in sprocket chainring, ie there are chainrings in 1 tooth increments, wheras 3/32 has less?

One of the bikes has a "formula single speed kit" which I assume is a regular cassette freehub with a spacers to convert it to SS?

So all I need is one of these (pretty cheap) in 1/8

http://www.ribblecycles.co.uk/sp/road-track-bike/sprockets-track-miche-sprocket-track/mchesptr200

KMC Z510HX

What is the smallest recommended sprocket to use (so have good chain contact)

then one of these
http://www.ribblecycles.co.uk/sp/road-track-bike/token-1-8-track-chainring/TOKECHRT200



However if a new quality freewheel is this expensive..
http://www.ribblecycles.co.uk/sp/road-track-bike/token-freewheel-sprocket-cromo/tokehubz205

redvee

[url=http://www.bikeradar.com/forums/viewtopic.php?p=19639063#p19639063]Father Jack[/url] wrote:

http://www.ribblecycles.co.uk/sp/road-track-bike/sprockets-track-miche-sprocket-track/mchesptr200

SF-MX30 is a freewheel, the above is a fixed sprocket

[url=http://www.bikeradar.com/forums/viewtopic.php?p=19639063#p19639063]Father Jack[/url] wrote:

http://www.ribblecycles.co.uk/sp/road-track-bike/token-freewheel-sprocket-cromo/tokehubz205

Never heard of Token freewheels, why not spend a few more pounds and go for a White Industries freewheel?

16t is the smallest freewheel you can get on a hub, you can get juvenile hubs which are smaller and intended for kids bikes but 14t is a common size. Why not go for 16t and a larger chainring?

father_jack

I thought sprockets fix onto a freewheel, much like a cassette? So for single speed, freewheels + sprocket is one unit?

http://www.stradawheels.co.uk/product/white-industries-eno-freewheel/

£73???? wtf

redvee

[url=http://www.bikeradar.com/forums/viewtopic.php?p=19639546#p19639546]Father Jack[/url] wrote:

I thought sprockets fix onto a freewheel, much like a cassette? So for single speed, freewheels + sprocket is one unit?

http://www.stradawheels.co.uk/product/white-industries-eno-freewheel/

£73???? wtf

Look on Ebay, you can find them closer to £50 if you strike it lucky. Worth it IMHO, you can service the freewheel easily and new parts are available. I fitted mine before Christmas and it's been faultless in the 3000 miles I've ridden with it and it makes a nice loud noise too, I've approached peds on cycle paths and freewheeled and with no sound from me other than the freeewheel they've looked round just before I was going to make myself known and moved aside for me.

father_jack

what happens when you wear the sprocket? You have to buy a whole new unit, or can you just buy replacement sprocket?

If it's whole new unit, then it's going to cost far more than a cassette!

redvee

[url=http://www.bikeradar.com/forums/viewtopic.php?p=19640281#p19640281]Father Jack[/url] wrote:

what happens when you wear the sprocket? You have to buy a whole new unit, or can you just buy replacement sprocket?

New sprocket ring for £35 from CTBM was the first link I clicked, probably cheaper elsewhere.

father_jack

Would this be ok?
http://www.hargrovescycles.co.uk/halo-clickster-freewheel-18t-black.html?gclid=CJf1gbPMyMYCFSbItAodjpcF4A

The Rookie

No, because as you clearly stated you want a 15T and they only do a 16,17 and 18T, they aren't any good for you.

father_jack

I'll see how I go for the new bike, 80 gear inches to 85 gear inches seem to be ok on the roadie/tourer. Depending on the bike (weight & tyres)

48/16 with 28mm tyres should be ok.
Stock gearing is 46/18, unsure what tyres are on it I'll see if it's too low. If it is I'll think of whether I'll get a 15T freewheel, or stick to 15T fixed (very cheap) Until I wear that out then change the lot to 48/16 1/8"