What ratio range would you prefer for general trail riding?

22/34 - 32/16
1
5%
22/32 - 32/15
0
No votes
22/30 - 32/14
3
15%
22/28 - 32/12
6
30%
22/26 - 44/17
5
25%
32/34 - 44/15
4
20%
32/32 - 44/14
1
5%
32/30 - 44/13
0
No votes
32/28 - 44/12
0
No votes
 
Total voters : 20

Alfine Ratios For A Mountain Bike?

Postby Tama on Tue 28/Apr/09 9:15am

Richie was around last night and we started discussing the compromise involved in running an Alfine internal geared hub on a trail bike.

My commuter bike is running an Alfine and has a low gear comparable to a 32/28 on a 26" mountain bike and a high gear comparable to 44/12. This works well for my commuter as the only steep climbing I do is on road.

Now the problem is if you're running only an Alfine on a trail bike for general riding you have to make the choice between sacrificing high gears for low gear or vice versa.

I've plugged some numbers into Excel and come up with a selection of comparable low/ high ratios an Alfine could do based on a 26" wheel and a normal 22/32/44 chainring set. I tried to compare it to a 36/24T double chainring but it got messy :huh:

Please be molesting the poll :)
Tama
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Re: Alfine Ratios For A Mountain Bike?

Postby Colin on Tue 28/Apr/09 9:30am

alfine + hammerschmidt
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Re: Alfine Ratios For A Mountain Bike?

Postby Tama on Tue 28/Apr/09 9:55am

Colin wrote:alfine + hammerschmidt
Or a Rohloff...

...however a Hammerschmidt is around $1,350: rez_display.php?c=190&mode=products&sort=&dir_id=0&search_terms=%2Bhammerschmidt - when an Alfine is around $450 so extending the range with a Hammerschmidt would come at a fairly hefty cost.
Tama
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Re: Alfine Ratios For A Mountain Bike?

Postby Colin on Tue 28/Apr/09 10:06am

Rohloff is also big $

These are costs my puny legs may demand
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Re: Alfine Ratios For A Mountain Bike?

Postby Henry Dorset Case on Tue 28/Apr/09 10:59am

A rohloff with wheel build would be round the $2k mark now?
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Re: Alfine Ratios For A Mountain Bike?

Postby richardg on Tue 28/Apr/09 11:15am

I am thinking a 28 or 29 chainring and an 11-34 cassette would do me, which adds up to about the 22chainring/28 sprocket in the list. I don't like riding faster than that, and if I am I will be coasting...

I'd say screw having two gearboxes on one bike, thats just greedy! I have a Rohloff on my bike and its mint, I get all those ratios at once! I'm thinking about making a alfine bike for Mel though becasue its pretty cheap, and I am sick of the crap derailler hanger on her bike...
AlfineRatios.xls
spreadsheet of ratios
Downloaded 81 times
richardg
Member for: 16 years 4 months

Re: Alfine Ratios For A Mountain Bike?

Postby swtchbckr on Tue 28/Apr/09 2:10pm

how much is an alfine?
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Re: Alfine Ratios For A Mountain Bike?

Postby j2hyde on Tue 28/Apr/09 2:31pm

Cannot open that spreadsheet, unrecognised file type????

It seems to me however that the alfine doesn't have quite enough range to match a good 2x9 setup.
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Re: Alfine Ratios For A Mountain Bike?

Postby Tama on Tue 28/Apr/09 2:34pm

swtchbckr wrote:how much is an alfine?

$450-$500 - but you need to factor in the cost of wheel build on top of that.
Tama
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Re: Alfine Ratios For A Mountain Bike?

Postby swtchbckr on Tue 28/Apr/09 3:01pm

spokes and a rim. building wheels is FUN
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Re: Alfine Ratios For A Mountain Bike?

Postby richardg on Tue 28/Apr/09 4:19pm

j2hyde wrote:Cannot open that spreadsheet, unrecognised file type????

excell tried saving it as .xlsx but that wouldn't upload, so I just changed it to .xls, hence it gives warning, so just yes through and it should open..

It seems to me however that the alfine doesn't have quite enough range to match a good 2x9 setup.


You are quite right, possibly, or maybe not? what makes a "good" 2*9 setup? Its part of the scummyness of the derailler, in that what do you do? go for a as wider range as possible (say a 22 / 66 combination = totally impractical), with minimum overlap, so that when you want to change the chainring you have to move the rear derailler through all its gears, or do you run a 22/32 combo where the 32 only gives you two or three nonoverlapped ratios? Do you need that extra range in your gearing? I guess thats the question..
richardg
Member for: 16 years 4 months

Re: Alfine Ratios For A Mountain Bike?

Postby j2hyde on Tue 28/Apr/09 5:49pm

I'm using openoffice which will open .xls but not .xlsx. Meh.

But the answer is yes I personally would use the extra range in gearing. Lowest gear should be about 24/34 (22/30ish?) and highest around the 36/11 mark.
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Re: Alfine Ratios For A Mountain Bike?

Postby richardg on Wed 29/Apr/09 2:16pm

Sorry thats a office 2007 thing, resaved as 97 excell..
AlfineRatios.xls
Downloaded 73 times
richardg
Member for: 16 years 4 months

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