Author Topic: Surly 110 bcd 36T  (Read 564 times)

julio

  • Sr. Member
  • ****
  • Posts: 313
Surly 110 bcd 36T
« on: June 12, 2019, 11:10:35 AM »
Hi,

Currently, difficult to get this chainring in 36t on the websites..

If somebody have or know where can i order it, let me know! thanks

 

martinf

  • Hero Member
  • *****
  • Posts: 635
Re: Surly 110 bcd 36T
« Reply #1 on: June 12, 2019, 09:32:14 PM »
110 bcd 36T seem to be unavailable at the moment on the sites I know.

If you're prepared to drop to 35T (lowers the gearing about 3%) the German Bike24 website currently has some stock.


rualexander

  • Hero Member
  • *****
  • Posts: 889
Re: Surly 110 bcd 36T
« Reply #3 on: June 12, 2019, 10:16:49 PM »

julio

  • Sr. Member
  • ****
  • Posts: 313
Re: Surly 110 bcd 36T
« Reply #4 on: June 13, 2019, 12:07:11 PM »
Thanks to you ! 

Martin,
I'm not sūre 35 x 16 or 17 would be recommended by Rohloff ..  even if in the mountains it could help me.

Loaded bike, i think 36X17 is ok for me, i find the first gear so important in the mountains, and 14 speeds is ok to ride at 30 to 35 km/h max (sometimes it's a little fair)
« Last Edit: June 13, 2019, 12:12:13 PM by julio »

martinf

  • Hero Member
  • *****
  • Posts: 635
Re: Surly 110 bcd 36T
« Reply #5 on: June 13, 2019, 07:56:45 PM »
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

  • Hero Member
  • *****
  • Posts: 695
Re: Surly 110 bcd 36T
« Reply #6 on: June 14, 2019, 12:44:17 AM »
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. 
« Last Edit: June 14, 2019, 03:34:18 AM by macspud »

julio

  • Sr. Member
  • ****
  • Posts: 313
Re: Surly 110 bcd 36T
« Reply #7 on: June 14, 2019, 12:43:28 PM »
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

  • Hero Member
  • *****
  • Posts: 635
Re: Surly 110 bcd 36T
« Reply #8 on: June 14, 2019, 03:37:51 PM »
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

  • Hero Member
  • *****
  • Posts: 695
Re: Surly 110 bcd 36T
« Reply #9 on: June 14, 2019, 09:38:12 PM »
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
« Last Edit: June 14, 2019, 09:41:32 PM by macspud »

julio

  • Sr. Member
  • ****
  • Posts: 313
Re: Surly 110 bcd 36T
« Reply #10 on: June 15, 2019, 12:00:53 PM »
Yes you're right Macspud, i have now a 16 t sprocket installed on my Nomad   :)

I know one thing, the first gear in 36x17 was so important for me to climb the mountain roads on long duration.

So effectively, i'm thinking to order a 35t and why not a 34 t if Rohloff manufactory accept this gear

« Last Edit: June 16, 2019, 08:09:14 AM by julio »

macspud

  • Hero Member
  • *****
  • Posts: 695
Re: Surly 110 bcd 36T
« Reply #11 on: June 16, 2019, 01:43:47 AM »
The 34 x 16 ratio (2.118 x) is just a little higher geared than 36 x 17 ratio (2.125 x) meaning  34 x 16 equal to 36.125 x 17. A 35 x 16 ratio (2.188 x) higher still equal to 37.19 x 17.

Your gear inches are initially were 15.2" - 80" on 37 x 17, after the cog change they were 16.2" - 85" on 36 x 16 and if you change to a 34T chainring would be 15.3" - 80.3" on 34 x 16, if you change to a 35T chainring would be 15.7" - 82.6".

martinf

  • Hero Member
  • *****
  • Posts: 635
Re: Surly 110 bcd 36T
« Reply #12 on: June 16, 2019, 07:39:10 AM »
Triton cycles seems to have both 34T and 35T in stock:

https://www.tritoncycles.fr

But no 36T.

One downside to using a small chainring/small sprocket combination might be increased wear, both of the chain and chainring/sprocket.

This was very noticeable for me a few years back when using a 34T single chainring with a DualDrive system a few years ago. But that was with an alloy chainring, stainless steel should be better.

38T seems to wear well, I have had 38x22 alloy chainrings on utility bikes for many years before getting my Rohloff tourer with a Surly 38T.