Vertical Drops are a Drag
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Vertical Drops are a Drag
here's the prob... trying to make a bike with vertical drops out into a single speed. i have a 38 tooth ring up front and a 16 tooth cog in the back. i've tried it with some crappy singleator imitation that i got from Nashbar but it's not working because i can't change the spring tension in the singleator. i think the tensioner spring is broken or something. so, i've tried to remove a couple of links in the chain and not use the tensioner but that makes the chain too tight to insert the rear axle into the drop outs. i'm about ready to get the Dremel out and make my own horizontal drop outs and solve the problem real quick-like . but before i do that i was hoping someone else had run into the same issue and had a good solution. also, just to let everyone know i also have a 15 and a 13 tooth cog to try on the rear. would that possibly work without making the gearing too low? any thoughts or advise would be much appreciated
thanks much
thanks much
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There is a reasonably good chance that the 15 will work, especially if the dropouts are not absolutely vertical and allow you to move the axle at least a millimetre or two. Remember, the 15 cog will only give a 6.7% bigger gear than the 16.
Try the halflink if you can: https://www.sheldonbrown.com/harris/chains.html
Try the halflink if you can: https://www.sheldonbrown.com/harris/chains.html
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You have a few options. What you ideally need is a "magic gear". Dig around here. The section "How do I tension the chain" should be helpful.
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Originally Posted by wetjett01
here's the prob... trying to make a bike with vertical drops out into a single speed. i have a 38 tooth ring up front and a 16 tooth cog in the back. i've tried it with some crappy singleator imitation that i got from Nashbar but it's not working because i can't change the spring tension in the singleator. i think the tensioner spring is broken or something. so, i've tried to remove a couple of links in the chain and not use the tensioner but that makes the chain too tight to insert the rear axle into the drop outs. i'm about ready to get the Dremel out and make my own horizontal drop outs and solve the problem real quick-like . but before i do that i was hoping someone else had run into the same issue and had a good solution. also, just to let everyone know i also have a 15 and a 13 tooth cog to try on the rear. would that possibly work without making the gearing too low? any thoughts or advise would be much appreciated thanks much
Do you have an 18mm cone wrench? You need one to install singulators correctly.
They look like this:
If you still have trouble, pop off the clip on the back of the singulator and open it up. Check to make sure the ends of the internal spring are seated inside the little holes that keep it in place.
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yeah.. i tried the cone wrench.... i think the spring is broken. there's no wire sticking in the hole that keeps the spring in place.
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"Without a care in this whole world,
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Try this:
https://www.teambigtime.com/software/ssConvert.htm
Or this:
https://www.peak.org/~fixin/personal/...p/tutorial.php
Helps you find the right gear combo for your bike without the need for a tensioner.
https://www.teambigtime.com/software/ssConvert.htm
Or this:
https://www.peak.org/~fixin/personal/...p/tutorial.php
Helps you find the right gear combo for your bike without the need for a tensioner.
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ok.. i did the FixMeUp thing and came up with a number of 47....is that the length of chain that will provide the proper chain tension w/out a tensioner?... i have a 38 tooth front ring running to either a 16,15,or 13 tooth rear cog(have the 16 on right now). the chainstay is 42.4 cm long if anyone wants to check my math
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"Without a care in this whole world,
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I assume you're using a road bike with 700c wheels? If so, then you plug in 38 as both the largest and smallest chain ring, and 16 as your largest cog, 13 as your smallest. You measured your chainstay length as 42.40 centimeters, and when you generate results you get:
Ring Cog Stay_length Chain_length Gear_inches
1 38 14 42.266 46.5 71.0
2 38 16 42.311 47.0 62.1
3 38 13 42.562 46.5 76.5
4 38 15 42.609 47.0 66.3
This means that none of your gear choices will *exactly* fit your chainstay measurement - note that the stay_length with 38 x 16 is 42.311 and with 38 x 13 and a half-link it's 42.562. 38 x 15 is longer still at 42.609.
Your best bet would be to:
A) Buy a 49t chainring and an 18t cog - that would give you a stay_length of 42.399 and a gear ratio of 71 inches (again assuming you have a 700 x 23c wheel).
B) Buy a 47t or 46t chainring - 47 x 16 would give you a 42.399 stay_length and a 77" gear, and 46 x 15 would also give you a 42.399 stay_length but an even bigger 80" gear (again assuming you have a 700c x blah blah blah).
C) Buy an Eno hub and rebuild your rear wheel or buy a new wheel built around an Eno hub - then use any of those chainrings and cogs you already have, or now have the option to use a lot of different ratios, buy some new chainrings and/or cogs, and find the ideal ratio for your riding style.
craig
Ring Cog Stay_length Chain_length Gear_inches
1 38 14 42.266 46.5 71.0
2 38 16 42.311 47.0 62.1
3 38 13 42.562 46.5 76.5
4 38 15 42.609 47.0 66.3
This means that none of your gear choices will *exactly* fit your chainstay measurement - note that the stay_length with 38 x 16 is 42.311 and with 38 x 13 and a half-link it's 42.562. 38 x 15 is longer still at 42.609.
Your best bet would be to:
A) Buy a 49t chainring and an 18t cog - that would give you a stay_length of 42.399 and a gear ratio of 71 inches (again assuming you have a 700 x 23c wheel).
B) Buy a 47t or 46t chainring - 47 x 16 would give you a 42.399 stay_length and a 77" gear, and 46 x 15 would also give you a 42.399 stay_length but an even bigger 80" gear (again assuming you have a 700c x blah blah blah).
C) Buy an Eno hub and rebuild your rear wheel or buy a new wheel built around an Eno hub - then use any of those chainrings and cogs you already have, or now have the option to use a lot of different ratios, buy some new chainrings and/or cogs, and find the ideal ratio for your riding style.
craig