Sturmey Archer gears.
- Thread starter stranger
- Start date
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If you REALLY want to get adventurous with a Sturmey cus there are hills:-
Try a 48/28 chainset with an 18 sprocket and a chain tensioner.
The Large chainring to No. 1 gear is 52" exactly. You will have 69" and 92" higher.
Small chainring to No. 3 is 53", so this is redundant, but you will have 40" and 30" gears at hand.
Sturmey made a 5 speed which didn't accomodate this range.
Try a 48/28 chainset with an 18 sprocket and a chain tensioner.
The Large chainring to No. 1 gear is 52" exactly. You will have 69" and 92" higher.
Small chainring to No. 3 is 53", so this is redundant, but you will have 40" and 30" gears at hand.
Sturmey made a 5 speed which didn't accomodate this range.
I've two bikes with Sturmey 3 hubs.
The BSA shopping bike is geared so middle is 52". I have no problem carrying two fourpacks of lager and two 2 litre bottles of pop.
It has a front basket for the curry.
My commute bike has middle as 54". 46 x 22. 26" wheel. I cruise along on 72" and use the 54" up a 10% either end of my trip. I keep the 41" in reserve when I take it on an Audax 100 populaire.
The BSA shopping bike is geared so middle is 52". I have no problem carrying two fourpacks of lager and two 2 litre bottles of pop.
It has a front basket for the curry.
My commute bike has middle as 54". 46 x 22. 26" wheel. I cruise along on 72" and use the 54" up a 10% either end of my trip. I keep the 41" in reserve when I take it on an Audax 100 populaire.
Well-it cost me £7.50 supply and fit for an 18 tooth sprocket--and now it's much more rideable. At least I can get up the immediate hills now. 
If I want a 22 tooth sprocket I will need a different chain apparently.
I'll see how it goes.
As it was a nice sunny morning I went to the stables on it this morning. It seemed to take an awful long time--but actually, on timing my return trip, it was only ten minutes each way.
If I want a 22 tooth sprocket I will need a different chain apparently.
I'll see how it goes.
As it was a nice sunny morning I went to the stables on it this morning. It seemed to take an awful long time--but actually, on timing my return trip, it was only ten minutes each way.
mickle
innit
- Location
- 53.933606, -1.076131
22t and 24t sprockets are readily available (not SA but will fit).
I'm so in love with the SA 3 spd coaster in my loop frame that Iv'e ordered a 3 spd SRAM Torpedo with a coaster for another bike.
I'm so in love with the SA 3 spd coaster in my loop frame that Iv'e ordered a 3 spd SRAM Torpedo with a coaster for another bike.
Big thanks to Mickle.
I've scoured the stores and found a 24T SRAM sprocket at Wiggle.
£2.93 is worth a punt.
On my Apollo gent's, it will give a 50" middle, 38" 1st and 67" top.
Top should roll my along at 15.5 mph at 81 cadence for 175W, or 1/4 hp.
The 38" low should get me up some fairly steep gradients, being 46 cadence at 5 mph.
The 50" middle is equivalent to a 50" diameter wheel penny farthing.
A little smaller than the 52" Starley was emulating, but I am a stumpy so 50" might be what I would have ridden
I've scoured the stores and found a 24T SRAM sprocket at Wiggle.
£2.93 is worth a punt.
On my Apollo gent's, it will give a 50" middle, 38" 1st and 67" top.
Top should roll my along at 15.5 mph at 81 cadence for 175W, or 1/4 hp.
The 38" low should get me up some fairly steep gradients, being 46 cadence at 5 mph.
The 50" middle is equivalent to a 50" diameter wheel penny farthing.
A little smaller than the 52" Starley was emulating, but I am a stumpy so 50" might be what I would have ridden
Arch
Married to Night Train
- Location
- Salford, UK
tyred said:
Yes, and then you add a triple chainring, and a Schlumph speed or mountain drive...
Well--now all the nasty snow, ice and rain has skittered off to another corner of the country I have been cycling all OVER the place on my 'tweaked sprocket' Dawes cycle. I am quite pleased with myself for sticking with it as it WAS hard work at first-- but I have cut my 'cycling to the horses time' down from ten to seven minute--and five on the way home because it is down-hill ALL the way.
I took my first commute today with the new 24T SRAM sprocket fitted.
26" wheel, 46T chainring gives 38", 50" and 68" gears.
I uploaded the Garmin 605 history and did the spreadsheet.
My Median speed was 15.7 mph. That's what I would expect if I was riding along a flat road on a still day.
On my Dawes Giro 500, my Median speed is around 17.1 mph.
Both bikes closely agree with my 'Super-duper' spreadsheet which takes EVERYTHING into account. Over 54 mins, the 'Super-duper' calcs were 28 seconds out.
The calorific replacement was 62 kCals. I was dressed for winter.
26" wheel, 46T chainring gives 38", 50" and 68" gears.
I uploaded the Garmin 605 history and did the spreadsheet.
My Median speed was 15.7 mph. That's what I would expect if I was riding along a flat road on a still day.
On my Dawes Giro 500, my Median speed is around 17.1 mph.
Both bikes closely agree with my 'Super-duper' spreadsheet which takes EVERYTHING into account. Over 54 mins, the 'Super-duper' calcs were 28 seconds out.
The calorific replacement was 62 kCals
. I was dressed for winter.
