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Old 02-18-17, 06:08 AM   #1
leoho5
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135mm Titanium Rear Triangle for Brompton

A 3rd party startup is offering a 135mm Brompton titanium rear triangle for those who may be interested in mounting a Rohloff or Alfine hub.

They are also offering chain tensioner with adjustable chain line.

https://vostok.bike/
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Old 02-18-17, 04:30 PM   #2
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Thanks for posting this. It looks very tempting.
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Old 04-16-17, 01:49 PM   #3
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nice. before this was available i had to perform this slightly nervous procedure..
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Old 04-16-17, 01:54 PM   #4
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all went well, the 2x10 is a fast joy to use, and has tight gearing with the range of an ordinary peleton racer. it weighs 11.1 kg complete with schlumpf, rack and pedals
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Old 04-16-17, 04:43 PM   #5
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Can't understand how a cassette would work on a Brompton.Fine until you fold it...I had a 5 speed freewheel on a Brompton and the chain was forever falling off when it folded..I had to keep the chain on in the folded position by using clothes pegs (pins in USA speak)
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Old 04-17-17, 01:37 AM   #6
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if you use a long-cage derailer it will take up most of the slack. was planning to add an extra tensioner on the lower jockey wheel a la steve parry. however havent got around to that as it has worked well without it, this because it turns out the chain rests itself in a predictable way on the derailer.

if you lay the bike on the side the chain might work itself off. but i hardly ever do that, so the parry solution has been put on hold. in my case it would suffice with a shorter tensioner than pictured. an alternative solution is using a bigger jockey wheel, but the chain is close to the ground as it is.
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Old 05-18-17, 05:16 PM   #7
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Anyone find out how much the vostok ti rear triangles cost?

re- chain slack: will one of the new sram or shimano clutch mtb rear derailleurs do a better job tensioning the chain?
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Old 05-18-17, 06:17 PM   #8
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Is this the same Russian company that has been making these parts as OEM for Brompton for several years now?
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Old 05-18-17, 11:07 PM   #9
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Anyone find out how much the vostok ti rear triangles cost?

re- chain slack: will one of the new sram or shimano clutch mtb rear derailleurs do a better job tensioning the chain?
i dont know if they are vostok, but there are third party titanium forks and triangles sold on british ebay. they are expensive enough so that buying a second-hand ti brommie seems a better idea, especially if you need a spare bike, and who doesnt? you then get the pedal bolt, chainstays and sometimes seat post titanium as well. and lighter headset, lighter wheels with a different front hub and reduced spokes.

the derailer i use is a long-cage road dura-ace. it doesnt quite tension the chain, so a steve-parry tensioner could be handy. birdy uses one quite similar. longer cage mtb derailers might be better, but you have to see to that the chain does not get too close to the ground. with an mtb-derailer a gear changer made for straight handlebars is easier to find.
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Old 05-19-17, 12:22 AM   #10
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Originally Posted by kais01 View Post
all went well, the 2x10 is a fast joy to use, and has tight gearing with the range of an ordinary peleton racer. it weighs 11.1 kg complete with schlumpf, rack and pedals
How did you attach the rear derailleur to the dropouts?
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Old 05-19-17, 12:42 AM   #11
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Originally Posted by kais01 View Post
all went well, the 2x10 is a fast joy to use, and has tight gearing with the range of an ordinary peleton racer. it weighs 11.1 kg complete with schlumpf, rack and pedals
Great DIY! You're a man (woman?) after my own heart.
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Old 05-19-17, 01:49 AM   #12
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Anyone find out how much the vostok ti rear triangles cost?
They sold it via indigogo for a while - this may give you an idea of the price: https://www.indiegogo.com/projects/v...ories-bicycle/
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Old 05-19-17, 02:27 AM   #13
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jur: thanks!

leoho5; i used a standard merida derailleur holder that sits directly on the axle, chose to have it on the inside, and thus had to widen the triangle a little extra; this way the chain is better cleared from the tubing when on the smallest cog.

when having the hub and derailleur setup ready and mounted it was easy to therafter center the rim with the help of tensioning the spokes. used the double-butted spokes from brompton, dont remember their length, but they come in two lengths with 2 mm difference for their front and rear wheels, the shorter model i used on the cassette side.

actually i took half of the spokes from a front wheel, then transplanted half of the spokes from a rear wheel onto it. so the front wheel is also assymetrical, but lengthwise and not sidewise. the shorter spokes there on the inside of the flanges and all going in the same lengtwise direction.
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Old 05-22-17, 02:37 AM   #14
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jur: thanks!

leoho5; i used a standard merida derailleur holder that sits directly on the axle, chose to have it on the inside, and thus had to widen the triangle a little extra; this way the chain is better cleared from the tubing when on the smallest cog.

when having the hub and derailleur setup ready and mounted it was easy to therafter center the rim with the help of tensioning the spokes. used the double-butted spokes from brompton, dont remember their length, but they come in two lengths with 2 mm difference for their front and rear wheels, the shorter model i used on the cassette side.

actually i took half of the spokes from a front wheel, then transplanted half of the spokes from a rear wheel onto it. so the front wheel is also assymetrical, but lengthwise and not sidewise. the shorter spokes there on the inside of the flanges and all going in the same lengtwise direction.
Thanks for the info on the derailleur hanger. May I ask how you kept the derailleur hanger from rotating around the axle?
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Old 05-22-17, 03:27 AM   #15
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Looks like a great product but at usd 568 plus shipping- is it hand made by Swedish wirgins and coated in organic panda milk?

(Sorry, just joking- I am 1/4 Swedish myself.)

I guess for a serious commuter or tourer it could be worth the money. Still much cheaper than a car... I always liked the IGH`s with no parts like pull chains and clickboxes sticking out on the side of the bike. You still need the chain tensioner on a B.

When are we getting a strong elastic "belt" that can be used without a chain tensioner on folders? That would be nice.
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Old 05-22-17, 01:34 PM   #16
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leoho5; here is a photo of the derailleur hanger. it stabilizes itself against the dropout with its rounded edge
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