Installing an IGH on a single speed and a chainguard
The aesthetics of single speeds is pretty fun, but compared to my road bike is seriously lacking in utility.
So, one project that I have in mind would involve getting a Mercier TT single speed from Bikesdirect, and at some point in the future install an IGH on the rear wheel with a bar-end shifter. Apparently Sturmey Archer has some promising models for the 2009-2010 season. Even better would be if I could just "drop in" the IGH without having to get new size spokes. Anyone ever done it? thoughts? Also, are there are any full-chain cases? Like, one that could cover both the top and bottom of the chain? Lastly...lots of these bikes have a 48t front cog. For the rear, how big should it be? IGH's tend to have their 1:1 on the highest gear? so it would be like 48t-20t and then go down from there? If I went too high a ratio, like 48t-16t, would I run the risk of damaging the IGH? |
It can be done but, trust me, every single step is going to be a lot more involved than you are envisioning.
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Make sure to check some of the commuter forum threads about IGH. A bunch of guys over there run that kind of setup. The Bianchi San Jose, Surly Cross Check and the IRO Phoenix seem to be popular ways to go. The Phoenix can come that way stock for about $650 I think.
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Originally Posted by Retro Grouch
(Post 9724187)
It can be done but, trust me, every single step is going to be a lot more involved than you are envisioning.
1) Decide what hub you want 2) Build it into a wheel or have bike shop build it into a wheel 3) Figure out how you plan to mount the shifter. (I used some scrap steel to fab up a bar end mount for the S-7 twist shifter) 4) Spread the rear triangle. (Sheldon's website can tell you how) 5) Replace BB with a new one with the correct length spindle. (in my case a 118mm did the trick) 6) Zip tie shift cable to downtube and chainstay. 7) Go ride! http://i64.photobucket.com/albums/h1...n/IMG_0984.jpg http://i64.photobucket.com/albums/h1...ssenger7-1.jpg http://i64.photobucket.com/albums/h1...ssenger7-4.jpg http://i64.photobucket.com/albums/h1...n/IMG_0949.jpg |
i put on a wald chainguard last night that i picked up from a parts bin for 5 bucks. terrible mounting, but it guess it works. I've been running a pretty wide chainline though, i'll probably have to move the chainring on the inside of my double cranks.
velo orange makes a fully covered chainguard. she ain't too cheap though: http://www.velo-orange.com/postch.html |
The complicated parts of course are installing it on the rear wheel.
I do want it to be as "drop-in" as possible. Why replace the BB? that's definitely not on the radar for this project. Are IGH's in general the same dimensions as regular rear hubs? Or would they require special length spokes? Getting spokes shouldn't be too much a prob, can probably get them for under $5...and spreading out the rear triangle seems iffy to me. |
Originally Posted by LupinIII
(Post 9724528)
i put on a wald chainguard last night that i picked up from a parts bin for 5 bucks. terrible mounting, but it guess it works. I've been running a pretty wide chainline though, i'll probably have to move the chainring on the inside of my double cranks.
velo orange makes a fully covered chainguard. she ain't too cheap though: http://www.velo-orange.com/postch.html really am surprised that chainguards aren't more widely available. |
Originally Posted by adlai
(Post 9724542)
Why replace the BB? that's definitely not on the radar for this project.
Originally Posted by adlai
(Post 9724542)
Are IGH's in general the same dimensions as regular rear hubs? Or would they require special length spokes? Getting spokes shouldn't be too much a prob, can probably get them for under $5...and spreading out the rear triangle seems iffy to me.
I understand that we all start somewhere so I'm not trying to be critical of you as you learn but based on your comments in this thread it does not sound like you fully grasp what is involved in this type of project. I recommend some more reading about hub spacings, chainlines, and wheel building before you begin. Good luck and if you have any more questions I'm happy to offer any assistance I can. |
Originally Posted by adlai
(Post 9724542)
I do want it to be as "drop-in" as possible. Why replace the BB? that's definitely not on the radar for this project.
Getting spokes shouldn't be too much a prob, can probably get them for under $5... |
Looks like HandsomeRyan and I were writing at the same time. Right on.
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I put an Alfine hub into my Singlecross (the singlespeed version of the Specialized Tricross cyclocross bike). While using a Nexus8 would be easier than an Alfine, it's not nearly as trivial as you are making it sound. You can read about that here.
I don't know what the new SA IGHs look like, but the one i'm familiar with only adds gear ratios above the one provided by the chainring and cog, so for starters you'd have to put a much smaller chainring and/or larger cog on to have low enough gears. You'd also need to "respace" the hub unless you start with a frame with mountain/hybrid dropout spacing (135 mm). The good news is that respacing would also reduce the impact on your chainline, perhaps making a new BB unnecessary. |
Originally Posted by pacificaslim
(Post 9724667)
Looks like HandsomeRyan and I were writing at the same time. Right on.
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didn't see the spoke cost thing. spokes are generally a dollar each, nipples about 10 cents each. i'd replace both.
it's funny that spokes seem to be the most expensive part of any of my wheel builds :/ |
actually, I believe that some IGH hubs, 3 and 5 speeds come to mind, are less than 135, about 120-ish or so. Sturmey Archer in particular seems to be aiming its newest hubs at single speed bikers who want to "upgrade"
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I just want to advise against the wald chain guard, having owned two and destroyed two, in about a month. Not only is the mounting hardware crap, the chainguard itself is cheaply made, and all it take is getting caught on your cuff once to be permanently bent out of shape. I bought a chainguard so I didn't have to roll up my cuff god damn it.
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Originally Posted by adlai
(Post 9725033)
actually, I believe that some IGH hubs, 3 and 5 speeds come to mind, are less than 135, about 120-ish or so. Sturmey Archer in particular seems to be aiming its newest hubs at single speed bikers who want to "upgrade"
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Originally Posted by Retro Grouch
(Post 9724187)
It can be done but, trust me, every single step is going to be a lot more involved than you are envisioning.
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Originally Posted by Retro Grouch
(Post 9727273)
See what I mean?
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