Thorn Cycles Forum
Community => Rohloff Internal Hub Gears => Topic started by: brummie on December 22, 2012, 07:53:12 PM
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Maybe of interest to the fully loaded tourers amongst us:
http://www.rohloff.de/en/news/news_rss/news_in_detail/archive/2012/11/december/article/SPEEDHUB_UEbersetzungsfaktor_von_mind_235_auf_ak/index.html (http://www.rohloff.de/en/news/news_rss/news_in_detail/archive/2012/11/december/article/SPEEDHUB_UEbersetzungsfaktor_von_mind_235_auf_ak/index.html)
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Brummie,
This *is* good news, indeed. I was using the default "legal low" of 40x17, but have now ordered a Thorn "up to" 38T bash guard and a 36T Surly stainless chainring to go with my 17t cog, giving a wonderful spread including truly low gears I will indeed use for loaded touring, as shown in the little chart attached here: http://www.thorncycles.co.uk/forums/index.php?topic=4412.msg29041#msg29041
Now, if Hebie will just make a Chainglider to go with the 36T 'ring! I've written them to ask if this is in their immediate plans, but they are off and away for the holidays, returning 7 January 2013.
Brummie, will you gear lower as well? If so, what do you have in mind?
All the best,
Dan. (...who loves Rohloff limbo contests..."How low can you go?")
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Brummie,
Brummie, will you gear lower as well? If so, what do you have in mind?
I'm only loaded up with a Nelson Longflap ! 44x16 is just fine at the moment !
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I'm only loaded up with a Nelson Longflap ! 44x16 is just fine at the moment !
<Shhhh...Brummie!>
<be verrrrry quiet about "only the Nelson Longflap"> :-X ...and the 44x16 combo will make you appear as Superman! ;) (at least to me with a 36x17)
After all...no one knows what's in The Nelson Longflap, and those bags can carry everything! :D
Best,
Dan. (...who thinks Brummie may have Legs of Steel with that 44x16)
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I've always wondered why they 'outlaw' low ratios, when the same mech (albeit with longer cables and bigger spoke holes!) can suffice on a heavily laden touring tandem. ???
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Eric,
Andre answered it best, here: http://www.thorncyclesforum.co.uk/index.php?topic=4412.msg29001#msg29001
Best,
Dan.
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Just to clarify I'm reading it right I can now run with 34-16 on my 29er and that's pretty much a standard gearing equal to a triple set up on a 26" mtb , with a 17" low and losing a bit of top gear topping out at 90" rather than about 96"
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Just to clarify I'm reading it right I can now run with 34-16 on my 29er and that's pretty much a standard gearing equal to a triple set up on a 26" mtb , with a 17" low and losing a bit of top gear topping out at 90" rather than about 96"
You got it, Firestarter. 34x16 is a ratio of 2.125, permitted. Gear inches would depend on the tyre circumference. With a Big Apple 60x622 the range is 17.5 to 91.8 gear inches. 36x17 will give you a tenth of a gear inch extra at the bottom end; pretty much of a muchness, though the bigger cogs might last a fraction longer.
Andre Jute
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Nice one thanks for confirmation ;)
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Now, if Hebie will just make a Chainglider to go with the 36T 'ring! I've written them to ask if this is in their immediate plans, but they are off and away for the holidays, returning 7 January 2013.
(...who loves Rohloff limbo contests..."How low can you go?")
Hi Dan,
I just find this 36T chainring for you http://www.hopetech.com/page.aspx?itemid=SPG424&tab=specification (http://www.hopetech.com/page.aspx?itemid=SPG424&tab=specification)
Happy New Year.... :)
Pete.....
;)
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36x17 will give you a tenth of a gear inch extra at the bottom end; pretty much of a muchness, though the bigger cogs might last a fraction longer.
And I believe that using a 17t sprocket will give you a longer chain life.
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Hi Dan,
I just find this 36T chainring for you http://www.hopetech.com/page.aspx?itemid=SPG424&tab=specification (http://www.hopetech.com/page.aspx?itemid=SPG424&tab=specification)
Happy New Year.... :)
Pete.....
;)
now now Pete do you want to drive the poor man crazy showing him all that bling. ;D ;D
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Hi Dan, I just find this 36T chainring for you
<gasp!> My, that is a lovely thing, Pete! It even has an integrated bash guard. Wowzers, that is a thing of beauty! I can hardly tear my eyes away, and I am sta...no...must.not.succumb to its Siren song, or all is lost; I'll be penniless and living under a bridge! ::) Jags, tie me to the mast and save me; this is bling-and-a-half, but subtle and "Class"!
The only thing that will save me from this beauty (which, I see, even comes in black if desired) is the Surly stainless I have already in my hot little hand, and the Thorn bash guard that is winging its way here. I can reverse the much harder stainless Surly 'ring when it starts to wear, and if I damage the bash guard...it won't also do in the chainring, as it might here.
Ah, me. It's nice just knowing such examples of CNC milling exist, Pete, and I appreciate hearing about it. Thanks for keeping me in mind!
All the best,
Dan. (...who has seen the equivalent of the puppy in the pet shop window and can't unsee it now)
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I could just see your black Nomad with the iconic gleaming gold chain-ring and bash guard on it. Bling-extravaganza ;D
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yes black and gold great combination Dan you have to get it ;)
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Aw, Man, guys! The sweet torture of it all! ::) ;D
All the best,
Dan. (...who.must.resist. )
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Next he'll be writing to me to enquire where he can get gold coach lining done...
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I have a friend who can do that!
Pete.....
:)
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Next he'll be writing to me to enquire where he can get gold coach lining done...
...and...I have a friend who can do that!
I'm okay on this one, guys! Hand-done coachlining is just it, as far as I'm concerned; the bee's knees and ne ultra plus of paint jobs. My 1980 Centurion ProTour15 is an example, done by hand with bamboo shafted horsehair brushes that hold the paint and dispense it evenly as it is applied. Burnt orange and cream over pearlized maroon with micronized gold metalflake under clear coat over double-chrome (over copper). See attached pic.
Whew. One of those is enough. And yes, I am a *big* fan of Andre's gold coach-lining.
And...now you've seen a road-dirty DanBike, fresh from the Outdoors before the compressed air post-ride cleanup. :-\
You guys are the best, you know that... ;) :D
Dan. (...who loves 'em all; lugs, fillets, and TiG welds, with paint glossy, fancy, and stealthy)
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Almost too nice to use...
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Almost too nice to use...
Thanks, Andre; that means a great deal. As it happens, I have used it...a bit over 35,000mi56,000km worth of use on the frame itself. I see I need to cut and level the clear coat again. I do so with an extremely fine rubbing compound about every decade or so, then finish it nicely with a polymer surface treatment. It is just under 33 years old, and a testament to the long life of steel (much of the use was on logging roads, fire trails and really bad gravel, sometimes heavily laden; the rest on pavement. Mudguards help a great deal in keeping a frame nice and add greatly to component life in my experience).
The quality Japanese factory chroming job added 15oz/425g to the frame weight; worth every bit of it in my opinion.
All the best,
Dan. (...who understands bicycles aren't just transportation, but also Art)
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Hi i'm sorry about the Hope rings, I'm looking at a nice Ti Chainring 36T or a 38T.
Maybe a Surly SS 38T ::)
A 37T would be good! not a 36 or 38!
Pete.....
:)
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Hi Pete!
Depending on which bolt-circle-diameter your crank has, Surly offers the following stainless chainrings:
Sizes: 94mm BCD x 30t, 31t, 32t, 33t, 34t, 35t and 36t
104mm BCD x 32t, 33t, 34t, 35t and 36t (nothing above 36T at this time)
110mm BCD x 34t, 35t, 36t, 38t, 39t, 40t, 42t, 44t, 46t, 47t, 48t, 49t and 50t
130mm BCD x 38t, 39t, 40t, 42t, 44t, 46t, 47t, 48t, 49t and 50t
Surly say...Our 94bcd,104bcd and 110bcd x 34/35/36t chainrings are made with a 2.2-2.3mm thick stock plate and work best with 5-8 speed chains. Many folks are using these on 9 speed drivetrains but this can often results in a "tight fit" right out of the box (This will loosen up and shifting should improve after the chain breaks in). The 110bcd 38-50t and all 130bcd chainrings are machine finished to have a 2.1mm tooth thickness and thus work fine with 9spd chains.
Sadly, no 37T, Pete.
Best,
Dan. (who was once missing a few teeth himself, but now has them back...)
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Hi Dan
I know about the Surly rings
I just have to make my own ring!
Pete......
.
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what would be the benifit of that pete.
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what would be the benifit of that Pete.
Hi Well?
I like odd number's, think that 36T will have too lower top gear.
I once see a photo of a gear being made out of Hard Wood in Africa for a truck gearbox, it worked for about 100km's.
I'm about to go for my 1st loaded (short) tour in year's so I'll See!
:o
Pete.....
;)
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good stuff pete enjoy the tour where are you heading and don't forget the camera. ;)
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We now have 19t cogs in stock 2 made for us at great expense :-) http://www.sjscycles.co.uk/thorn-sprocket-for-rohloff-hubs-prod28817/