Is this a good start? What else would I need?

mynameisphunk

I have been considering building a singlespeed mountain bike, and have come across this setup on Ebay:

http://cgi.ebay.com/New-SS-Single-S...1QQcmdZViewItem


Is this a pretty good start for a singlespeed project? What else would I need - wheelset (can I use any wheel with a 135mm hub?), brakes, saddle, a bunch of spacers and a rear sprocket, handgrips, pedals, tires...anything else? All that stuff can be had relatively cheaply, correct?

Ideally, I'm looking to first - experiment with bike building (total newb), and also experiment with single-speed, which I've never ridden. I don't want to spend terribly much, $350 or less total, and would like to end up with a rig that should hold up to some good abuse on the trails.

Would I be better off with a Motobecane Outcast for $340 shipped?

http://cgi.ebay.com/NEW-MOUNTAIN-BI...3QQcmdZViewItem

I know neither of these options are the BEST - I'm not looking for the best, just something that will rock for the money.

Hasukawa

The things I would look out for on a MTB frame for single speed use are; non-vertical dropouts (this is a must for SS). I'd stay away from aluminum, especially on a rigid frame. Try to find a steel rigid frame, steel absorbs the best as rigid. I don't trust regular aluminum for the main components of a bike (frame, head, rims). a non-alloy aluminum frame can buckle. if you run a low enough gear ration this might not be that big of a problem. you have to remember that running a SS with a nice ratio means you are exerting much more pressure on your parts than with a normal geared bike. Speaking of ratios I would figure out what kind of MTB riding you want to do to help determine your ratio. It doesn't make sense to have a MTB that can't climb, yet you also don't want to be outpaced by a BMX. Id try a 40x16 on a MTB, depending on your cycling abilities. The standard top gear on a geared MTB is 48x16. To get an idea on what a top line SS MTB looks like check out the Trek 69er but this is too over engineered for my tastes. Play around test it out, if the gearing doesn't work you can always change it up. I think the most thing important is choosing the right frame, make sure you have dropouts that are somewhat horizontal and that the frame can withstand the abuse, because more than likely the frame will be your biggest cost for the set up, everything else is just an upgrade. oh yeah, dont mess with a tensioner if your going SS, it's just something else to get screwed up and it's easy to tension a chain line anyways, just make sure it's as straight as possible and only slightly slack. if it's too tight you run the risk of stripping something or blowing spokes. for the components, get what fits you and what fits your budget and riding style. experiment with set ups.

mynameisphunk

Why are horizontal dropouts a must if you have a chain tensioner? What are the functional downsides to running a chain tensioner? Besides the lack of horizontal dropouts, does the Dirt Research frame/crank/stem etc... look pretty good on Ebay? For $180ish shipped for all that, I should be able to put it together with spare parts and it should come in under $300 for a starter SS bike, which is all I'm looking for.

If there is no real downside to a chain tensioner besides the looks of it, then that doesn't bother me.

Hasukawa

One of the great things about a SS is the true chain line, it helps to make your pedaling more powerful. No pully's to go through and the chain is straight and has as little resitance as possible. A chain tensioner is needed if the dropouts are vertical, yet is acts as a pully for your line. Last night I actually stumbled upon a bizarre hub http://sheldonbrown.com/harris/singlespeed.html#hubs that is designed for vert dropouts and single speed use, yet the downside is its 160ish dollars. So with that case, yeah go with a chain tensioner if you have a vert drop out. But I'd say try and get horizontal or semi-horizontal if you can. Good luck and have fun, because thats what its really all about. If you can post pics when you get done with it, i'm slowly workin on a MTB SS project myself. I'd get it done faster if i didn't keep having to fix my SS roadie.

Old Guy

It sounds like I was in the same boat...looking for a first SS project, had some parts around, etc. Well I purchased the exact Dirt Research kit your looking at and it is now built up. I live nearby the seller and actually met the gentlemen in person, great guy. Anyway..the frame is way beyond my expectations for the price. Great paint and welds. The bike built up beautifully! As for the price, it would be almost impossible to beat for what you get. As for vertical dropouts, they are no problem with the tensioner. When you fit the chain to length, install the tensioner and thread the chain. Then pull the tensioner up tight to the chainstay and zip tie it there. Pull the chain as tight as you can before connecting. I needed to take out about a half a link more then I could stretch it to get it as tight as I personally wanted it. Here's my trick. Allow the chain to fall off the bottom few teeth of the chainring and then pin the chain. Simply pedal forward to get the chain on all the way and you'll have a chain every bit as tight as with horizontal dropouts. Good luck and let me know how you make out.

mynameisphunk

I actually ended up picking up a leftover '06 Redline Monocog for $330 shipped, 21" frame (perfect for me, 6'4") - couldn't pass that up for a complete bike. I'm picking up a used K2 Zen V converted to single speed for the wife to give it a shot as well

Thanks for your help, I'd love to see pics of your Dirt Research build!