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  #3121  
Old 02-15-2012, 04:24 AM
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The_Aleman The_Aleman is offline
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Default Re: what did you do to your motor bike today?

Quote:
Originally Posted by happycheapskate View Post
I politely disagree. The derailleurs with integral hangers brace against the dropout nicely, and the anti-rotation pin can couple with a top-hat nut (usually come with them) or conventional nut and washer, behind the dropout. You do not have to drill a hole in the dropout for the anti-rotation pin. If you have a good eye and steady hand, you can weld a hanger tab on any standard dropout. I put one on a BMX when I was a kid, and made a 7speed BMX chopper that worked nicely.
Only generic multispeed bikes use that method, always with generic derailleurs, too. The bike you linked to is a generic as well. Bikes properly designed for derailleurs have the right provisions from the get-go.

One of these will work with proper derailleurs on generic bikes, tho:

http://problemsolversbike.com/produc...illeur_hanger/
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  #3122  
Old 02-15-2012, 04:32 AM
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Ibedayank Ibedayank is offline
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Default Re: what did you do to your motor bike today?

Being the diamondback drifter can be had for $150- 300 depending on if singlespeed coaster brake or 7speed Vbrakes. I dought it uses the same level of parts as a $500 and up bicycles
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  #3123  
Old 02-15-2012, 05:09 AM
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happycheapskate happycheapskate is offline
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Default Re: what did you do to your motor bike today?

Thanks, Aleman. I have seen some derailer hangers before, that mimicked the type I linked to, in attachment, but were threaded for the derailers with their own anchor bolts. The one you posted looks like a really nice piece of work, but works only for QR axles, not threaded, solid axles. I will remember that part though. Very nice.

Yes, the ones with the married hangers are usually used on the lowest end bikes, but some people who like loaded touring, or off road riding like them, for very low replacement cost of an expendable part that still works quite well. I've got a Tourney rd. on a road bike, and works just as well as some of Shimano's finer offerings.
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  #3124  
Old 02-15-2012, 10:32 AM
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Skarrd Skarrd is offline
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Default Re: what did you do to your motor bike today?

Quote:
Originally Posted by 5-7HEAVEN View Post
JMO, I think you're in for a disappointing ride with those gears. You will definitely know this when you're stopped at the bottom of a steep ramp or hill, and try to climb it.

Ask me how I know this.

With a 3-ish hp 10,000rpm engine, you'll be making less than 2hp @ 6,000rpm.

If your engine has 10,000rpm capabilities, you'll be shifting @ 10,000rpm, not 6,000rpm. No one shifts 4,000rpm short of the redline.

My 2.8HP Tanaka 47R engine is rated @ 7,000rpm redline. With the pipe, I'm shifting @ 8,000rpm or a little less. If I'm putting around, I shift @ 5500rpm.

Here's how your gearing works @ high rpm.

First gear.....22.9mph @ 8,000rpm.....28.6mph @ 10,000rpm.
Second gear.....32.5mph @ 8,000rpm.....40.6mph @ 10,000rpm.
Third gear.....35.4mph @ 8,000rpm.....44.3mph @ 10,000rpm.
Fourth gear.....38.9mph @ 8,000rpm.....48.7mph @ 10,000rpm.
Fifth gear...43.3mph @ 8,000rpm.....54.1mph @ 10,000rpm.
Sixth gear.....48.7mph @ 8,000rpm.....60.9mph @ 10,000rpm.
Seventh gear.....55.6mph @ 8,000rpm.....69.5mph @ 10,000rpm.

You will run out of road in second gear.

In comparison, here's my gearing @ 7,000rpm redline and 8,000rpm:

First gear.....12.1mph @ 7,000rpm.....13.9mph @ 8,000rpm.
Second gear.....15.9mph.....18.1mph @ 8,000rpm.
Third gear.....17.9mph.....20.5 @ 8,000rpm.
Fourth gear.....20.6mph.....23.6mph @ 8,000rpm.
Fifth gear.....24.3mph.....27.7mph @ 8,000rpm.
Sixth gear.....27.5mph.....31.4mph @ 8,000rpm.
Seventh gear.....31.7mph.....36.2mph @ 8,000rpm.
Eighth gear.....37.5mph.....42.8mph @ 8,000rpm.

Hmm, good point. I'll see how it handles, right now the first reduction is 6t to 40t, i can always get a bigger gear from mcmaster.com i think they have it up to 70t or something crazy. Like that.
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Traditional bicycle riders think we're cheaters. Non riders think our bikes are toys. Bicycle shops think we're a threat. Tree huggers think we're polluters. The police don't know what to think.
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  #3125  
Old 02-15-2012, 11:06 AM
5-7HEAVEN 5-7HEAVEN is offline
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Default Re: what did you do to your motor bike today?

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Originally Posted by Skarrd View Post
Hmm, good point. I'll see how it handles, right now the first reduction is 6t to 40t, i can always get a bigger gear from mcmaster.com i think they have it up to 70t or something crazy. Like that.
Your sprocket combination is almost perfect.

All you need to do is replace the 40t right-side chainring sprocket with a 24t from SBP.

That one sprocket change will change your bike into an motorized bicycle with dirt-bike throttle response.

Last edited by 5-7HEAVEN; 02-15-2012 at 11:22 AM.
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  #3126  
Old 02-15-2012, 11:13 AM
5-7HEAVEN 5-7HEAVEN is offline
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Default Re: what did you do to your motor bike today?

Ibedayank, The Aleman and happycheapskate.....

THANK YOU!

The bike looks ALMOST exactly like Ibedayank's pic, except there are cable guides under the length of the down tube.

I am glad that there is an adaptor available to hang a good-quality 7-speed derailleur. I'll definitely get that piece!
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  #3127  
Old 02-15-2012, 11:32 AM
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rustycase rustycase is offline
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Default Re: what did you do to your motor bike today?

...what was THAT???
Skaard... u lunched ANOTHER motor???
Wha happened???

...derailers... I got a bunch of em... non-descript, probably NOT best quality.
if anybody wants one, PM me and I'll mail it for the shipping cost.
...suppose I should take pics of the parts I got way plenty of that I will never use...
rc
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  #3128  
Old 02-15-2012, 06:57 PM
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Spaz_Static Spaz_Static is offline
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Default Re: what did you do to your motor bike today?

Today I...

Cut an old inner tube into a 6 inch sheath to put on my cross bar under my fuel tank. I've been having problems with the vibrations making my tank rotate around the tube, and if I'm not paying attention, it rotates far enough that it pulls my fuel line off the petcock. Rubber applied for more grip, rode probably 20 miles after the fix, no rotation whatsoever.

I also picked up a spring and some picture hanging wire from ACE hardware to make using my choke easier. It's kind of a hack job at the moment, but it gets the job done. Spring pulls the choke lever back down, wire with a tab lets me pull it up. This makes it so that I can easily apply choke and remove it from the engine without having to bend over, fish around, and try and flip the choke while riding. One hand on the throttle, one hand on the choke, pedaling, and having the engine start kicking up always felt crazy and like I was about to lose control and crash. This fixed it, even though it's a quick-fix.

Noticed my spark plug wire was coming off of the plug. When I went to push it back on, it didn't budge. I took it off to see what was the matter, and pieces fell out. Managed to get it all back on, but I'm wanting to replace the cable. Went by a car shop and asked if they had any spark plug wires laying around I could have, the guy reached in a tool box and handed me one, just like that. Right now, I've got the spring out, and it seems to be running fine, but I'd like a more firm connection since it seems to not have anything but gravity holding it on anymore.
Attached Images
File Type: jpg Tank rubber.jpg (205.6 KB, 37 views)
File Type: jpg choke spring.jpg (237.1 KB, 49 views)
File Type: jpg plug cap.jpg (170.2 KB, 43 views)
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  #3129  
Old 02-15-2012, 08:13 PM
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Skarrd Skarrd is offline
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Default Re: what did you do to your motor bike today?

Quote:
Originally Posted by rustycase View Post
...what was THAT???
Skaard... u lunched ANOTHER motor???
Wha happened???

...derailers... I got a bunch of em... non-descript, probably NOT best quality.
if anybody wants one, PM me and I'll mail it for the shipping cost.
...suppose I should take pics of the parts I got way plenty of that I will never use...
rc
lol, these china girls do NOT like me one bit!
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They see me rollin'
they hatin'


Quote:
Originally Posted by biknut View Post
Traditional bicycle riders think we're cheaters. Non riders think our bikes are toys. Bicycle shops think we're a threat. Tree huggers think we're polluters. The police don't know what to think.
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  #3130  
Old 02-16-2012, 02:05 AM
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happycheapskate happycheapskate is offline
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Thumbs up Re: what did you do to your motor bike today?

Use any "modern" derailleur (like this type)
http://ecx.images-amazon.com/images/I/41EgDS3tl-L._AA300_.jpg

on any bike with long dropouts (like we were discussing)

$10
http://www.yourprosolutions.com/imag...97_168x126.jpg

http://www.yourprosolutions.com/prod...c0e48b1e234abc

Really, though, you can craft one from a piece of aluminum or thin steel flat stock. I made one of aluminum before, and the bolt on the derailer was hard enough to cut threads in it. It worked fine but flexed a little when cross chaining heavily on a 20" bike.

Ebike stop is good company, they have the fancy "emergency hanger" $13. I've bought from them before, fast shipping.
http://www.ebikestop.com/problem_sol...ger-FS0920.php

Here's another emergency hanger that gives some adjustment $15
http://derailleurhanger.com/dh199.php



Quote:
Originally Posted by 5-7HEAVEN View Post
Ibedayank, The Aleman and happycheapskate.....

THANK YOU!

The bike looks ALMOST exactly like Ibedayank's pic, except there are cable guides under the length of the down tube.

I am glad that there is an adaptor available to hang a good-quality 7-speed derailleur. I'll definitely get that piece!
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