yelworc

The distance is 115mm - 4.53in

badmother

Sturmey Archer S-RF5(W) ?5 speed freewheel rear hub kit - Brompton Spec - Black | eBay

5 speed, no brakes, OLD 111, 28 holes.

I am using one on my Brompton and like it a lot.

Edit: Sturmey Archer S-RF3 - 3 speed freewheel rear hub kit - 110mm OLD Brompton | eBay

Edit 2: Sturmey Archer X-RD3 Rear 3 Speed 36h 70mm Drum Brake Hub internal gear bike

Three speed with drum brake. OLD 117, 2mm more than you have. I`d say you can squeeze it in.

Edit 3:https://www.ebay.com/itm/Sturmey-Arch...hub-kit-Brompt
on-Black-/253061241052?hash=item3aeba018dc:g:yFgAAOSwY3BZJkeK
Three speed, made for Brompton so same as the 5 speed.

5 speed for Brompton again, this one for two sprockets again but then you need to find a rear derillium again

Edit 4: Sturmey & Archer Elite ATS 5Star 5Gang Nabe Getriebenabe Trommelbremse, England | eBay

5 speed drum brake. OLD 117, 36 holes (not so good but possible to solve).

Edit 5: Shimano Nexus SG-3C41 3-Speed Internally Geared Coaster Brake 36h Rear Hub | eBay

Shimano 3 speed w coaster brake. 120 mm OLD.

yelworc

Thanks for your examples, I would like to have minimum 5 speed hub with roller (drum) brake.

badmother

Looks like the ATS hubs are the narrow ones (117 OLD). I would look for a 70mm drum brake, not a 90mm. You do not want a high flange 36 hole hub on a 16" bike.

Also I would prefer one of the Brompton specific hubs on a small wheel, with 28 holes. I would personally give up the drum brake (and I love drum brakes) to get a better wheel with low flange and 20 holes.

It is all about searching since they may not be in production at present so looking for a NOS hub.

badmother

On minimum 5 speed: On one of the sites I linked to with lots of pix there is a bike with a 8 speed hub. You could try to contact them and ask how they did it, what hub and what modifications. Some of those bikes are crazy moded so maybe some bending and welding and a new powdwercoat

Edit: https://www.ebay.de/itm/Sturmey-Arche...-/152622722124

Low flange, dirt cheap (depending on price for shipping to your place) but 36 hole. You need to look into the rim thing before deciding if you can use a 36 hole hub. Steel shell so slightly heavyer than alu shell.

It is possible to build a wheel with different number of holes in rim and hub but only if all the holes in the rim is being used. You need different lenghts of spokes for such a build. I have done it once and BF used to do it in the olden days.

Therer are also other hubs like Sachs, but not sure if they have less than 36 holes. I have several vintage Sachs hubs, 5 speed coaster brake. All of them 36 holes.

badmother

Brompton Sturmey Archer 8 speed Rear Hub X-RF8 Kit 325% 28 holes 20T OLD 120mm | eBay

This is the 8 speed they use for brompton. No brake.

Edit: https://foldingbike.biz/epages/7665e3...EARWHEELSPECPR

A wheel ready to install.

You want 5 gears at least but maybe talk about ratio instead. Find out what you are curently riding from a gear calculator and then decide what you want. Amount of gears is not the best/only way to describe what you need.

Also I think I remember you wanted better shifting. Did you look into getting your present setup working properly? Cleaning and lubing all piviot points on the rear der? New cables and wire? Is the shifter working as it should or can a new one do better?

yelworc

From time to time I travel in Finland. There is a hilly landscape and 5-speed hub is not enough for a comfortable ride.

What can you say about Sturmey Archer X-RD8 https://www.sjscycles.co.uk/hubs-int...-hole/?geoc=RU

badmother

The hub I am sure is great but it is 36 spoke holes so finding a 36 hole 16" rim can be a chalenge. You may be looking at a wheel build with different spoke lenghts: https://www.bikeforums.net/bicycle-me...b-24h-rim.html

The OLD on the hub is 131 so 16 mm more than the space you have available but should be doable. i once did something similar on an older steel bike that came stock with a 2 speed kickback and I built a new wheel for it with a Nexus7 hub. That was a 20" bike so longer seat and chain stays. I cut the brake bridges (short horizontal piece going from one stay to the other and where brakes is normally atatched) down the middle and installed the wheel. then off to a welder to insert a small piece of steel in the gap the wider hub made in the bridges. Needed some new paint but my bike was/is hand painted...

Weight of the hub is 2600gr + housing cable and shifter so be ready for that.

On the site you linked to there is three downloads for this hub.

https://www.sjscycles.com/Instruction...ifications.pdf

This page say you can get it in a 28h, 32h and 36 hole. Also different OLD, one in 132, 134, 135 and 120 OLD. My guess is that this is the same gear hub but with different brake options. You`d be lucky to find a 28 hole drum brake version. Need more time to look into that.

There is one guy here in the forum that converted his Dahon Curve to a 8 speed but I think that was a no brake hub, using the bikes V brakes.

Another sheet say you only get 25, 23 and 20t sprockets for this hub so make sure you run it trough a gear calculator to see if you get usable gears. Your one piece crank with fixed chainring is not easy to replace. Doable but expensive.

https://www.sjscycles.com/Instruction...Parts_List.pdf

Take a look here and make sure it can be installed on your bike (dropouts etc) https://www.sjscycles.com/Instruction...structions.pdf

Looks like the narrowest version of the hub is the F, that is free wheel, no brakes. That is why it can be narrower. You need to find a way to deal with the missing 16mm if you use this hub.

It should be possible to find the hub you linked to in 32 hole. Try to ask shops if they can orf\der it for you- that is if you can find a 32h 16" rim.

Edit: https://foldingbike.biz/epages/7665e3...632HBLA%5B2%5D

yelworc

Oh sh.t! another problem!

badmother

Ask in bike shops if they can order the hub in 32 hole version and use the 32 hole hub I linked to.

yelworc

I found out that Sturmey Archer 8 speed IGH and Shimano 8 speed IGH have different gear ratio (don't know is that correct word?) SA - from 1 to 3.054, Shimano - from 0,527 to 1,615. So what hub will be better for riding on hills? Sorry, I'm new to these issues

smallwheeler

interesting thread. badmother supplying valuable info as per her usual. just like to note: thread started with OP looking to replace a cheap derailleur, a few days later he's on course to build an igh wheel. hehe. and so it goes...

yelworc

Yes, the info is very valuable

smallwheeler

curious - is the yellow bike you posted your bike or just for reference?

badmother

The hub you picked IMHO. Wider ratio to explain it in the easy way is almost as having one more gear only the "distance between the gears" are slightly bigger so you can climb steeper hills. Like two staircases with the same amount of steps but one with taller steps than the other so it takes you a bit higher with the same amount of steps.

Also the hub is made especially for smaller wheel bikes so you can use a smaller chainring than on the Shimano hub. There is more but it is not important, I`ll not confuse you with more

yelworc

My bike is black and it's the same as yellow one.

badmother

Some old threads that could be interesting:

https://www.bikeforums.net/folding-bi...tes-later.html

https://www.bikeforums.net/folding-bi...8-120-old.html

https://www.bikeforums.net/folding-bi...zen-tokyo.html

https://www.bikeforums.net/folding-bi...ear-range.html

https://www.bikeforums.net/folding-bi...rnal-hubs.html

https://www.bikeforums.net/folding-bi...16-folder.html

Schaltungsumbau auf S/A X-RF 8w

I was reading about a Brompton conversion to the SA8 hub (click the top left of this page) and found this about chain line. That is something you need to look into too.

https://blog.pedalitis.com/2013/03/0...n-lubrication/

yelworc

What IGH will fit better to my bike - SA 8 speed or Shimano 8 speed - in the case of a more convenient hill ride?

yelworc

Is this rim suitable for my tasks - Sun CR18 16 x 1 3/8, 349 ABT Alloy Rim - Black - 36 Hole
https://www.sjscycles.co.uk/rims-tap...-hole/?geoc=RU

badmother

Nope! The 349 is the magic number. That is a 16" rim that is bigger than your 16" rim. It would be the right size for a Brompton or a BF Tikit but not for your bike and not for a Dahon Curve. This is confusing I know. I looked at all the SJS rims before going to the other page that I linked to. SJS has got only one rim in your size but it has got the wrong number of spoke holes, that is 20 holes. The magic number you are looking for is 305, that is your 16" size. This one is the right size but wrong number of holes:

https://www.sjscycles.co.uk/rims-tap...ilver-20-hole/

There are (and was) lots of different 16" rims/tyres. The 305 and the 349 are the two you can expect to find in shops and they are not interchangable.

https://www.denrustneeike.no/files/dekkdimensjoner.pdf

badmother

On hill ride it would be the SA hub you picked. Take a look at the links I posted where peopel have discussed and shared opinions. Some peopel complain about that hub being noicy. You must decide what is more important to you.

yelworc

What about this rim ?
https://www.niagaracycle.com/categor...004a-36x14g-cp

AccuNeal

Good choice. I just built two wheels using those rims. One with a 3sp SA coaster brake and one with a 3sp Nexus coaster brake. The steel finish (before being chromed) was not perfectly smooth. As a result the chrome is not ery high gloss like some of my older wheels. Of course, once they become slightly dirty it's not too obvious.

badmother

Well done finding a 16" (305) rim with 36 holes. I did not think they existed. The rim is steel but the curent rims on your bike may be steel too. It is going to be a H E A V Y wheel but if that is what you want that is what you build. 36 spokes is way more than you need on such a small wheel but it makes the whole thing simple to put together. You now need to decide on lacing pattern (if there is a choice at all with the short spokes you`ll be using). Ask yelworc for advice and or pictures of his build unless you just ask somebody to build it for you.

yelworc

What spokes length should I choose for SA 5/8 speed hub and Wm Steel 004A Rim, 16x1.75, 004a, 36x14g, Chrome?