Alfine gearing and chain choices for a Fat Bike?
I have an alfine-8 on my ‘odd do it all bike’ thingy – 700c wheels.
I’ve put a 20th rear sprocket, paired with a 42th ring. The 18th that was on the rear was just too tall to pull the trailer/camping gear when fully loaded.
Of course, if you are building from the ground up, then just use whatever the alfine comes with, and buy a front chainring to suit (SS chainring, unramped etc)
DrPPosted 3 years ago
Why not run just a single 32T up front and then a 22T on the back. then you wont have to use a nasty chain tensioner.
I run 32 x 21 and have very nearly as low a gear as my double chainring conventional bike (22T granny)…… and I haven’t run out of top end gears yetPosted 3 years agodroflufMember
I had an Alfine 8 with 32:20 on my Pugsley which got me up most things, only having to get off and push in deep snow or very slippery mud. If you want it spinny I’d be inclined to go 32:22 or even 30:22 if you can get a chainring. I was looking for more of a compromise between spinny and cruising along so kept a ‘longer’ gear.
Also depends on your fitness and the terrain you’ll be riding onPosted 3 years ago
I want to build my first Fat Bike with an Alfine hub. I’ve only had a quick spin on one so am not certain of what sprocket-ring combination to go for.
The crank set is currently 22 32 44. I’m after a gearing range which will be best suited for a spinny pedalling. There are a couple of rear sprocket options 18T or 20T. Will I need a wider chain ring? What chain should I use?
I want to use the bike for some bike packing in the hills and for coastal riding.
Can anyone suggest a sensible gearing combination?Posted 3 years ago
Will an Alfine only use the sprockets listed by Shimano?
I will make up an order later but so far I’m thinking of going with…
On one list only 18T or 20T Sprockets.
Chainring I’m thinking one of these with 32T
ChainPosted 3 years agoSTATOMember
With an 18t on the alfine the output range is equivalent to a 11-32 cassette -ish. So stick a 20t on and the output range drops a %age (equivalent to the difference in ratio of the previous gearing).
Any shimano or sturmey (apparently) hub gear sprocket will fit, tho you might need to watch the cable/shoft arm on the hub as with bigger sprockets apparently it can foul. On-one are not the cheapest tho. Also, i think 8 speed chains work (anyone?) and tend to be cheaper than 1/8 for some reason.Posted 3 years agoscotroutesSubscriber
Quick reply.. last winter I ran my 11 speed Alfine with a double ring up front and using the Alfine chain tensioner. I’ve completly ignored Shimanos gearing recommendation (which only applies to the 11 speed in any case) and had no issues at all. I didn’t get around to refitting it this winter. It’s a pretty hefty wheel right enough and that makes it a bit of a drag on certain terrain (which is why I run 2×9 the rest of the year.
The Nexus sprockets also fit, so you have more choice.
Use the gearing calculator on Sheldons site if you want to play around with numbers.
Fatbikes definitely play well with low gearing – all that traction. However, there are a few stories of knackered Alfines once they’ve been heavily used in coastal conditionsPosted 3 years ago
However, there are a few stories of knackered Alfines once they’ve been heavily used in coastal conditions
I spoke to Coastkid about shoreline Alfine durability. He used as part bike part submarine, so I’m not wholly surprised at its limited life expectancy.
I like the simplicity of the straight chainline, low maintenance and reduced chances of tearing a mech off through heather.Posted 3 years agoSaccadesMember
Depends on your fitness I guess.
I’ve 2x alfines, a Pompino with 44:20 which would be way too high for you and a 456 with 32:20 which is brilliant. I’d suggest you go 32:22 as a start, I’m 220lb and get up 99% of everything I do with my 3×9.
The benefit to nexus sprockets which hasn’t been mentioned is that unlike the Alfine, they are off-set – so brilliant if your chainline is a little off. I’m still using a whipperman? Anti rust SS chain thing for the last 5.5 years, in fact none of my 2 alfine drivechains has been changed.Posted 3 years ago
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