3 speed speedster

[sparky]

28% to 13% or whatever then back to 28% was a pretty awkward jump for me, tho. The crank was missing some piece too, and I decided to go with the bike that already had the motor on it. The DownTube was certainly a much better bike, tho.... it's just that I was really buying the bike for the 8spd hub, and afterward I found out if something DID happen, I wouldn't be able to fix it myself. That was it for me. I know you can't shift under load, but I'm personally not a fan of seamlessly shifting derailers while I'm pedaling, much less completely stopping for internal gears. BMXs and NuVinci are my cuppa tea.

 

[duivendyk]

It does appear rather extreme, over a two to one difference in step size.Other manufacturers of these type of hubs like Shimano do a lot better in this regard.These hubs are all monsters of complexity,comparable to a tiny automatic transmission.The NV looks like a marvel of simplicity and should not be all that expensive to manufacture, really,but that does not get to be reflected in the price it seems.

 

[RATRODER]

I'm personally not a fan of seamlessly shifting derailers while I'm pedaling, much less completely stopping for internal gears.

sparky you don't have to stop to shift, I just let off the gas and shift (up&down) louis

 

[sparky]

sparky you don't have to stop to shift, I just let off the gas and shift (up&down) louis

That's what I meant... stop pedaling or gassing. I've always liked BMXs best because there's no jerking, no derailer to adjust, and just constant power to the wheels. NuVinci is the same way, but with the ability to change gear ratios -- SUH-WEET!!

Like I said, there's still a loss of power even with derailers where you don't need to stop, and there will be even more loss of power when you totally stop pedaling (or gassing) for that one second. I'm a little nitpicky sometimes, and this is one of those times. Tho, I would definitely scoop up an internally geared hub with 3 to 5 gears if it was cheap... just to mess around with, since I can repair it myself (can't do that with an 8spd hub).

 

[davidsis]

How fast will it go???????????????

 

[sparky]

My point still stands that the SA 8spd hub has funky stepping between gears, is nearly impossible to work on for the average joe, and loses power when you let off to change gears.

 

[duivendyk]

If you want to get up to speed on internally gearedhubs go to www.sheldonbrown.com .All sorts of info on these devices.It appears that the Shimano hubs (4,7and 8 speed) are not all that hard to take apart afterall,it's fairly straightforward to take the guts out in toto,putting them back together again might be another matter.Looking at my old Shimano hub I have concluded that it may well be possible to put dual sprockets on these things after all,it involves welding two of these dished input sprockets back to back together at their periphery,this creates adequate axial space between them for both chains.The trick is to mount this assemblage on the hub.To that end an annular ring of material has to be removed from the outside sprocket to make it possible for the for the locking snap ring to be installed.I think it is doable.These sprockets come in various sizes up to 22 t.In this manner you could retain pedaling ability(to keep the cops off your back),but also have a decent multi gear capability.

 

[TwoWalks]

A project I've been thinking about for some time,now that got off my lazy b**t. It is a 70cc ht run to a 22t sprocket jack shaft,then a 10t to a 22t on the hub. It needs a lot of work yet,but so far so good.Yes I know no peddles. louis

As usual, I really like the frame. One you built that I drool over all the time is "Evans" racer. Do you build your own frames from scratch or alter existing frames? I would love to build my own frame but I would not trust my enemies arse on a frame I welded let alone my Arse.

 

[RATRODER]

TwoWalks yes I do build from scratch. I was never satisfied with the cruiser frames,(they do build nice bikes,but not my thing)
I'm building a road bike,(existing frame) that has the right look to it.louis

 

[TwoWalks]

TwoWalks yes I do build from scratch. I was never satisfied with the cruiser frames,(they do build nice bikes,but not my thing)
I'm building a road bike,(existing frame) that has the right look to it.louis

The frames you have built for the Board Track racers are fantastic. Great job. As stated above, I am in love with the "Evans" bike, my future dream. Guess I am going to have to figure out "how" or "where" to build a frame similar to that.