Private Classified > Wanted
Surly 110 bcd 36T
martinf:
For riders under 100 kg a combination of 35x17 is well within the current Rohloff recommendations.
Link to discussion in this forum below:
http://thorncyclesforum.co.uk/index.php?topic=11313.0
There is supposedly also an advantage in using odd numbers of teeth, but I am a bit sceptical myself.
Personally, I don't really notice a 1-tooth difference on a chainring. For my Spain tour on a triple chainring derailleur bike a few years ago I wanted a 40T middle ring, local bikeshop only had a 39T so I went with that instead.
I use 38x16 on my Raven Tourer, because this was the minimum allowed by Rohloff at the time I bought the bike. I don't want to change the chainring size, because 38T is Chainglider compatible and smaller chainrings are not.
I do intend to fit a 17T sprocket to lower the gearing a bit when my current 16T wears out. I'd go to 38x19 it wasn't for the Chainglider, as I don't really need my current highest gear on a loaded touring bike.
macspud:
Have you contacted https://www.bikemonger.co.uk/surly-stainless-steel-chainring-110bcd-123-p.asp?_=&variantid=1064&gclid=EAIaIQobChMI6om13eDk4gIV1PhRCh0kwwoAEAQYASABEgKb3PD_BwE according to their website they have a 36T in stock and appear to post worldwide.
As martinf said, Rohloff's lowest safe recommended combinations for riders under 100kg is now a chainring 1.9 times larger than the rear cog. 32 x 17 is permissible so if you'd be happy with 35 x 17 it would be fine.
jul:
Not yet, but thanks for the link Macspud.
I have a dought about the 35 t chainring.. for sūre even if it could help me in mountains, sometimes i ride on the flat, wind in the back around 35 km/h and with my 36 t chainring it is a little fair if you know what i mean. (38 t will be better in this condition..)
I will think about it
martinf:
35x17 gearing gives a speed range of 6.4kph to 34kph assuming a pedalling cadence of 90 rpm, which is what I average in normal riding.
I very rarely ride a loaded tourer at 34kph on the flat, and tend not to pedal on fast downhills, so 35x17 would certainly be OK for me.
The only time I often want to pedal faster than 34kph is for large roundabouts, when I like to match the traffic speed as far as possible. I get round this by increasing cadence, at 110 rpm the top gear with 35x17 equates to about 45kph. I can also drop cadence to about 60 on very steep climbs, at 60 rpm bottom gear with 35x17 equates to about 4.3 kph, which is a walking speed.
The validity of this depends on your pedalling style, I "spin" with 150 mm cranks, but not as fast as Dan. Others prefer to "mash" at lower cadences, often with longer cranks, so need higher gears.
macspud:
I wasn't quite sure what you meant by "fair" but I understand now. :)
I guess the question to ask is, what kind of terrain will you be riding during the next part of your tour? With over 15,000 km under your belt already you will be very aware of both the bike's and your own capabilities.
Now, just to be sure. Did you not recently replace your worn 17T Rohloff cog with the new 16T spare cog you had with you? http://thorncyclesforum.co.uk/index.php?topic=13268.0
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