Birdy thread
#1826
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This is when you use the standard 28t physical chainring. When you use a 38t physical chainring, which you can if you order it with the 130 BCD chainring adapter, you get 38 / 54 / 68t equivalent. See https://www.efneo.com/gearbox/technical-details/
You can go even bigger than the 38t physical, but I don't think there is any need. You can't use any size between 28 and 38. It must be either 28, or 38, or bigger.
You can go even bigger than the 38t physical, but I don't think there is any need. You can't use any size between 28 and 38. It must be either 28, or 38, or bigger.
They also advised that it can achieve chainline from 42mm to 46mm which I assume is within chain line distance of Birdy?
I will obviously start considering this if after extensive use the 11t smallest cog will not be enough.
#1827
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All valid points. Thank you. I am leery about spending that kind of money on someone who isn't from here or I know at least tangentially. I figured on a Thudbuster for the Helix, but I hadn't thought of dynamo solution though. Regardless, a little more patience and phone time may be needed. Thanks again.
#1828
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Now, personally, I wouldn't use any of both on the Birdy, the 9-32 or 9-34 cassette solution is much better, it has a better efficiency and weight less (FYI., I have a Schlumpf High Speed Drive on another bike).
For Helix, there is also a big question-mark about what will happen now that they announced that they won't be able to provide the many remaining Kickstarter and pre-ordered bikes and if they have to refund many backers and pre-orders that do not want to add money to buy an Helix at the full price
#1829
Full Member
Just received a reply from Efneo. 1st gear is direct drive with no efficiency loss. I believe my 36t cog should be enough for hills which I will test first of course. If not and I’ll need even lower then 38t will make sense. Then most likely the second gear will be used most of the time which will be less efficient. But if my 52t will do fine on hills do you think the 52t first gear will make sense as it’s a direct drive with no efficiency loss? Apparently Efneo will accept any 130BCD chainring. Then second gear can be used (74t equivalent) if 11t smallest cog will not be enough.
They also advised that it can achieve chainline from 42mm to 46mm which I assume is within chain line distance of Birdy?
I will obviously start considering this if after extensive use the 11t smallest cog will not be enough.
They also advised that it can achieve chainline from 42mm to 46mm which I assume is within chain line distance of Birdy?
I will obviously start considering this if after extensive use the 11t smallest cog will not be enough.
Chainline - I'm not sure. Sheldon Brown says the common standards are road double 43.5 mm, road triple 45, and MTB triple 47.5 - 50. The road standards are likely assuming 130 mm OLD hubs, while the Birdy uses the MTB standard (and now also road?) 135 mm hub spacing. That could mean 47.5 is the ideal, and the Efneo 46 mm is a little narrow. I'm not sure though. Efneo should be able to advise.
https://sheldonbrown.com/chainline-multi.html
Did you tell them you have a Birdy? I see it is not listed as compatible on https://www.efneo.com/gearbox/gtro-for-folding/
The Efneo has a reaction arm that must rest against the frame. It could maybe interfere with the seat tube when folding the Birdy. Efneo should know.
#1830
Full Member
glye thanks for advise about the arm resting on frame. Yes, I did inform them about model of bicycle but they didn’t say anything certain about the chainline, only range.
I don’t think it will be safe for me to experiment as I have almost no knowledge in this area and no one implemented it successfully.
I don’t think it will be safe for me to experiment as I have almost no knowledge in this area and no one implemented it successfully.
#1831
Full Member
Beware that both Schlumpf and Hammerschmidt require you to modify your Birdy frame: https://www.biketinker.com/2010/bike...-double-fixed/
For Efneo and Patterson this is not required (but I don't know if they will fit the Birdy).
For Efneo and Patterson this is not required (but I don't know if they will fit the Birdy).
#1832
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The ATS Sclumpf speed drive for the Brompton doesn't require a chamfer of the bottom bracket box. I also don't know if it will fit the Birdy.
#1833
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Nice to have the ATS option! Schlumpf is well regarded quality. Efneo is less common, but it has been around a while by now. It got a very good review in road.cc in 2017.
https://road.cc/content/review/22779...-front-gearbox
I am considering it for another bike, but there the lack of any option between 28t and 38t is a bit of a problem.
https://road.cc/content/review/22779...-front-gearbox
I am considering it for another bike, but there the lack of any option between 28t and 38t is a bit of a problem.
#1834
Full Member
I checked some pictures and it looks like the R&M Birdy Touring once folded rear on the rear rack wheels from one side and the rear fender/mudguard from the other. Is it normal that it rear on the rear fender when put on the floor?
#1835
Full Member
The front fender may also touch the ground, and it has a similar pad. But it will not take as much weight, so the front fender stays are normal thickness.
#1836
Newbie
(p.s. the easy wheels seller sent me the wrong color. I ordered black…. They are sending me the correct one.)
Last edited by jackyharuhiko; 06-30-22 at 02:55 AM.
#1837
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Yes, the rear fender stay is very thick. There are two reasons for that.
First as Glye says, because the folded bike rest on it.
But the stay is also used to hold the bottom of the rear pannier with the hook of the rear pannier.
The folding rear rack is a very clever design and there are few folding bikes that allow to use big rear pannier without hitting them with the heels while pedaling..
On my Ti Birdy, I have Ridea easy wheels similar to he one of jackyharuhiko and a Ridea rear mudguard (unfortunately, the Ti Birdy doesn't accept the folding rear rack). The Ridea rear mudguard is crap, its a piece of thin aluminum that break after a couple of months of use, I had to reinforce it with a titanium plate.
First as Glye says, because the folded bike rest on it.
But the stay is also used to hold the bottom of the rear pannier with the hook of the rear pannier.
The folding rear rack is a very clever design and there are few folding bikes that allow to use big rear pannier without hitting them with the heels while pedaling..
On my Ti Birdy, I have Ridea easy wheels similar to he one of jackyharuhiko and a Ridea rear mudguard (unfortunately, the Ti Birdy doesn't accept the folding rear rack). The Ridea rear mudguard is crap, its a piece of thin aluminum that break after a couple of months of use, I had to reinforce it with a titanium plate.
Last edited by Jipe; 06-30-22 at 03:06 AM.
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#1839
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I like the big size of those! I have the folding rack, which is good but the wheels are very small. They can catch on tiny steps/cracks, which might damage the rack. I guess it would be easy enough to find something bigger, I just need to measure for fit.
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#1840
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Jipe I heard that since the rear rack is suspended, the rear panniers tear off and scratch fender connection as rear suspension constantly moves.
Yes, the original easy wheels are small and thick, they prevent to mount some rear pannier. Their axle is an M6 bold like for the Brompton.
I mounted bigger 60mm, thinner third party easy wheels for Brompton bought on Amazon.de they allow to use Vaude Road Master Roll-it Waxed lightweight big rear pannier.
Last edited by Jipe; 06-30-22 at 05:01 AM.
#1841
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€22? These cost $4.82 a pair on Aliexpress, delivery to Turkey is $5.09
#1842
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Yes, and you have to wait for months for the delivery while with Amazon they are delivered the next day !
You must also be careful because there are several models very similar but not identical.
You must also be careful because there are several models very similar but not identical.
#1843
Full Member
It’s simply not true. You’re probably mixing things up with Aliexpress few years ago. Nowadays they deliver within a 7-10 days to Turkey. Should be about the same delivery time to EU if they send it from China. But most sellers already have warehouses in EU with options to ship from there. Should be even faster.
Up until now I don’t remember receiving anything different from Aliexpress but what I’ve ordered. If it’s Litepro it would be Litepro which you will receive. And your amazon listing reads exactly that.
Of course nobody can stop you to pay x4 times the price if you want.
Up until now I don’t remember receiving anything different from Aliexpress but what I’ve ordered. If it’s Litepro it would be Litepro which you will receive. And your amazon listing reads exactly that.
Of course nobody can stop you to pay x4 times the price if you want.
#1844
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Assuming Birdy can be converted to Rohloff hub after purchase, can the Rohloff hub be ordered separately as a kit for Birdy? If yes in which exactly configuration and where it can be ordered?
#1845
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You can easily build a Rohloff wheel or have it built by several online shops in Germany.
But to mount a Rohloff on a Birdy as done on a factory built Birdy Rohloff, R&M and Pacific Cycles use some specific parts that can only be ordered from them.
About the easy wheels, the link you gave says: estimated delivery to Belgium Aug 1st. Its one month but my experience is that the estimation is not reliable, the actual delivery time is unpredictable because orders of several customers are grouped for shipment and then the shipment is awaiting for an affordable shipment opportunity.
The problem of long delivery of items coming from China (not only Aliexpress) is a consequence of covid and the huge increase of shipment costs.
But to mount a Rohloff on a Birdy as done on a factory built Birdy Rohloff, R&M and Pacific Cycles use some specific parts that can only be ordered from them.
About the easy wheels, the link you gave says: estimated delivery to Belgium Aug 1st. Its one month but my experience is that the estimation is not reliable, the actual delivery time is unpredictable because orders of several customers are grouped for shipment and then the shipment is awaiting for an affordable shipment opportunity.
The problem of long delivery of items coming from China (not only Aliexpress) is a consequence of covid and the huge increase of shipment costs.
#1846
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Just arrived home and unpacked the bike to give it a quick test ride. Everything seems normal and I found Supernova light to be surprisingly good for street riding. Will not be replacing it. I removed low rider from the front fork which could probably block the light so light is unobstructed. Definitely not as good as Edelux II but pretty good for already preinstalled light.
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#1847
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Could anybody suggest the size/length of the bolt keeping rear rack wheel in place? It was bend probably on the airplane and I need to order replacement.
#1848
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To replace the bolt you need to take it out. Can you do it? Do you need to straighten it out, at least partially, before progressing? By eye it looks like M6.
#1849
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yes, I can take it out. It’s bent at the connection point to the rack, so it unscrews just fine. After removing not sure if I can straighten it without damaging the thread.
#1850
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If any part of the bolt is non-threaded, that's also worth measuring.