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Very interesting work... What's your chainline looking like with the crankset offset by 3.5mm? You can check this with a yardstick held parallel to the chainring and drawn back to the cassette. If you're close to the middle of the cassette, you're probably fine. I think the ring...

Re: Progress so far: IOW IOW, I am amazed (and pleased) that you were able to get this to work. Tell me about the crankset you are using. Looks like a standard triple with the outer ring not yet installed and a small granny ring. We recommend that the only triple that will...

Front Derailleur Cable Routing These photos are of an SV1.5, but other than how the ring clamps interact with the BB (they clamp to the BB bearings instead of the BB shell) the arrangement should be essentially identical. I used the teflon inner lining from a Nokon cable set to guide the...

Some one else on the forum... ... has converted that Walmart bike and it came out pretty well. If the bike you are considering using the components from has a 1 1/8 inch threadless headset, the fork from it probably won't fit the Walmart head tube (those bikes usually use 1 inch steerers...

External Bearing BBs The bearings should be "fairly tight" in the BB shell. If you tighten them too much, after riding a short distance they WILL NOT COME OUT EVER AGAIN. This is a BAD THING. The bearings are reverse thread on one side so that the motion of the crank tightens them as...

Seat Angle My frame is still in transit, so these are just thoughts I've had around this question, based on design drawings and what I know from the design process. Considerations: 1. Structural integrity of the seat must be maintained. This means the seat back will likely require a...

Windex... ... makes a great temporary lubricant for installing tight rubber parts (like handlebar grips, for example, or in this case, the elastomer). It lubricates long enough to install the part, and then evaporates.

Fitting the ring clamps As Eric notes, the Silvio 2.0 requires an external bearing bottom bracket. Shimano Ultegra, 105, and SRAM Rival, Force and Red have been tested. I cannot recommend Campagnolo as the bottom bracket bearing shells vary in external configuration. A flat-sided 44mm diameter...

Charles, as usual, is correct... Something else to consider is how the crank sits on the bottom bracket axle. Road cranksets tend to sit farther down on the bottom bracket axle taper than MTB cranksets. So if you change the cranks and keep the old bottom bracket, the inner chainring may end up...

Rear elastomer spring The disc that is threaded into the spring "port" is used to adjust the spring preload. Turn it in or out to slightly change the ride height and to adjust the working compression distance and the "softness" of the rear suspension. Since the elastomer fits down into the...

Stem cap clearance When the headset bearing "stack" is assembled, dimensional variations from all the pieces combine. Add to this a small amount of manufacturing variation in the fork construction, and we get what you're seeing here. The solution is to add a 3mm spacer on top of the 5mm...

Our frame builder lays the paint on pretty thick... ... which is a good thing for paint durability, but tends to hide some of the smaller threaded holes. Also, you may find that you need to remove some paint on the insides of the dropouts to allow the axles to enter and leave the dropouts...

Hub for potential conversion from 135mm to 130mm This is the Shimano tech doc for the M525 Deore freehub: http://techdocs.shimano.com/media/techdocs/content/cycle/EV/bikecomponents/FH/EV-FH-M525-2067B_v1_m56577569830728349.pdf I have a set of these wheels on my Sofrider CityBike. They...

Nicely done... There's been a nice crop of conversions lately, and this is one of them. I learned the hard way about shoelaces, too. Now I double tie them and tuck them to the side. These are pretty rugged bikes when all is said and done, and steel frames aren't so heavy as to bother...

It'll work fine... ... but it'll cost more. The kit components are based on Sofrider parts. The Sofrider is our "most amortized" tooling set and our simplest design. To keep the conversion kit affordable, we simply over-run production of those components for Sofriders and package them as...

I think this needs to be a sticky post at the top of this forum Nicely compiled. Thanks a lot for the research.

I don't see any reason why it wouldn't fit Might have to use some shims to get the alignment right. Actually, for a Rotor ring, $80 isn't too bad - the 52-54t rings can be almost $200...

Blog Post is up... ...with photos and illustrations. Let me know if you have any questions. Best, Doug

How this headset works Andrew, if it weren't for people questioning my knowledge, I probably wouldn't know anything... A seat post clamp won't work because the purpose of the part is different. The top clamp on the Dia Compe Diatech (or ABN) headset isn't intended to secure the clamp...

you pay for wheel weight twice... A heavier wheel figures into the equation twice. First, there's the actual weight addition, just like adding water bottles or anything else. Then there's the rotating intertia. Wheels have to be accelerated, and adding weight to the wheels adds rotating...