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PostPosted: Mon Sep 03, 2018 3:29 pm 
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ajm wrote:
...it would certainly make things simpler for you too...


My thoughts too :D

Never done internal hub gubbins before so would be learning from the start. Well, I once dripped some oil into a Sturmney Archer 3 speed hub. Once. Got to be worth a look though.


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PostPosted: Wed Sep 05, 2018 4:04 pm 
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Related to the above issue with brakes, looking some more into in-hub gubbins raised the option of an internal gear and brake solution. It would certainly be tidy and low maintenance, would allow a single chainring and sprocket so hugely reduce the likelihood of the chain parting company.

Shimano Nexus stuff looks OK, reasonably priced but perhaps a bit weighty and not exactly pretty. I guess a roller brake might be better to handle than a coaster brake which sort of limits options, and I'd be looking for a good range of gears, 7 or 8 speed seem common enough. The higher spec Alfine stuff looks to be all disc brake rather than internal so not much use really since the whole point is an alternative to discs brakes. Offerings from Sturmney Archer, SRAM etc are all there too. I’ll need to ‘weigh up’ the comparison to normal components. Any advice welcome!

Two early issues for me really. First that I would have to buy stuff, I already have normal gears and brakes in the spares bin so any new kit would add to the build cost. Second is I have zero experience of operating, servicing or maintaining such systems so don’t really know what I would be letting myself in for.


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 Post subject: Re:
PostPosted: Wed Sep 05, 2018 6:46 pm 
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Hay ric finally got a chance to get up close to me heckler. Here’s some pics for reference

What I will say is you can use a 6 bolt hub but the wheel doesn’t go in and out very easily where as I then got a set of 5 bolt hubs ( and swapped the axle) and they work great.

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Sorry about the paintwork she’s due a strip and repaint.


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PostPosted: Fri Sep 07, 2018 12:41 pm 
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thanks for the piccies. Its really useful to see it in-situ nice and clear.

I think my part looks different to that so maybe not a Hope item but another brand - or maybe the design changed over time.


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PostPosted: Tue Sep 11, 2018 2:17 pm 
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right, I have been looking at in-hub gears and its too darn complicated and expensive, so shelving that idea for now. But maybe I’ll revisit it if I can get my hand on a cheap, good setup :D


Tim, my brake adaptor thing looks rather different to that one, I'll get some piccies up see if we can work out what it is for sure before I consign the idea to the bin.


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PostPosted: Tue Sep 11, 2018 2:54 pm 
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How expensive is too expensive? I like the look of the Sturmey Archer RX-RD5 at about £120 (obviously you'd need a shifter too - thumbshifter is about £15 so not too bank-breaking!)


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PostPosted: Tue Sep 11, 2018 3:28 pm 
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yeah thats a bit much for my piggy bank right now.
If I can use my existing disc brakes and normal gears then thats fine and cost is minimised. I do like the idea of this. I was looking more at the 8 speed (RD8) but that's more like £150-170, plus the shifter and sprocket like you say. I guess the range will be similar just with fewer increments.

Maybe something will come up in the sales :D


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PostPosted: Thu Sep 13, 2018 2:08 pm 
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Weight comparison – gears

Right, the hub gears thing is still bothering me.

Forget levers/shifters and cables for now, chain too. Let’s assume whatever I do I will have those. Lets look at a rear wheels worth of brakes and gears, taking XT 750/755 9sp as a benchmark:
V brake arms ~220g
Rear mech ~245g
Cassette ~260g
Hub ~400g

That’s ~1.1kg for good old fashioned v brakes and derailleur gears.

But I would be looking for the disc brake setup, and the equivalent disc hub comes in at more like 500g, and lets take the hope mono mini as a benchmark (coz I have some in the shed) its listed at ~400g (although BB7 would come in at closer to 350g) and the external gear plus disc brake setup weighs in at (brake @ 400g + hub @ 500g + cassette @ 260g + mech @ 245g) around 1.4kg.

Compare that to a Nexus 7sp (~£150) in-hub setup all of that gubbins is in one hub with the gears inside and a roller brake bolted to the side, listed at 1.5-1.6kg depending where you look.
That’s only a ~200g difference.

The sturmney archer RD8 (~£180) with 8 internal gears and drum brake is listed at 2.2kg and the RD5 (£125) with 5 gears a whopping 2.2 or 2.4kg depending whether you go for the bigger brake. That's at least another half a kilo to consider there compared to the shimano offering.

Blimey.


Not much to choose on price but there is a definite weight advantage to the Shimano unit.
Is the SA just built "better"?

Still not sure I can justify spending the money but its certainly got me thinking.


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 Post subject: Re:
PostPosted: Fri Sep 14, 2018 6:11 pm 
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Took some piccies of the rear disc adapter thing I have. Looks to me like this is intended to sit outside the dropouts, looking at the way the dropout part is offset outwards rather than inward of the disc mount point, so with the mounting point located above the stays where I would expect it to the dropout hangs outside the frame.

Or am I looking at it all wrong?

I tried placing it against a frame, slotted it onto a canti stud. It looks to sit the mount quite vertical if that makes sense, maybe the arm is intended for a larger frame / wheel although it's not a huge difference. More work required!


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 Post subject: Re:
PostPosted: Fri Sep 14, 2018 6:46 pm 
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I think you are right rick looks totally different to my hope and I agree it looks like it should go on the outside. What you could try is (if you have a wheel, disc and caliper) is trial fit the wheel and offer up the caliper against the mount and see how it looks


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