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Singlespeed & Fixed Gear "I still feel that variable gears are only for people over forty-five. Isn't it better to triumph by the strength of your muscles than by the artifice of a derailer? We are getting soft...As for me, give me a fixed gear!"-- Henri Desgrange (31 January 1865 - 16 August 1940)

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Old 03-25-07, 08:38 PM   #1
badevilcow
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wider tire = lower gear ratio?

Okay i know i've seen the answer to this somewhere.. and i tried searching but i must be botching the 'search info'

but this weekend i went from 700x23 kenda kontenders (blah) to 700x28 panaracer tservs (yum) and i feels like i'm pushing a higher gear inch..(my legs also no longer hurt.. and i love how comfy thoes tires feel) soo before anyone flames me... i run a 45x16.. and i'm thinking about throwing on a 17tooth cog.. does running bigger tires really affect your gear inch THAT much? just wondering thanks alot
-badcow
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Old 03-25-07, 08:41 PM   #2
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cattle
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Old 03-25-07, 08:42 PM   #3
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There's more surface area and rolling resistance, that's why.
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Old 03-25-07, 08:44 PM   #4
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bongz. also, yes.
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Old 03-25-07, 08:47 PM   #5
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yeah i'm well aware of the extra surface area.. however, being 235 it feels like i'm rolling faster on 28's then 23's.. i'll just throw on a 17 and leave it be.. thanks!
-badcow

cattle it is
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Old 03-25-07, 09:14 PM   #6
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Moving from 23's to 28's creates a slight increase in gi (1"?). An internet gi calc (may i recommend http://software.bareknucklebrigade.c...it.applet.html) will let you know exactly how much, and what kind of difference the 17 will make in the mix.
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Old 03-25-07, 10:55 PM   #7
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Quote:
Originally Posted by badevilcow
yeah i'm well aware of the extra surface area.. however, being 235 it feels like i'm rolling faster on 28's then 23's.. i'll just throw on a 17 and leave it be.. thanks!
-badcow

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they make 17's??? i may have to pick some up immediately, i love me some narrow rubbers.
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Old 03-25-07, 11:11 PM   #8
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17 tooth cog
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Old 03-25-07, 11:19 PM   #9
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god damn it, i was hoping for some insanely narrow tires.
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Old 03-26-07, 03:50 AM   #10
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wow.. thanks for that internet calc., that program is amazing.. that is what i needed.. thank you!

-badcow
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Old 03-26-07, 06:30 AM   #11
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Wider tires do have an increased diameter, and because pi times your diameter is the distance you go each time the wheel spins you go further per spin of the cranks.
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Old 03-26-07, 06:43 AM   #12
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bike tires are usually square, as in the width equals the height.........so by getting a wider tire you also get a taller tire
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Old 03-26-07, 07:38 AM   #13
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as someone about the same size as you, I run wider tires as a rule (for comfort, mostly). I just made a run on 23s last night. They are super fast, but you have to ride them hard as rocks. You should read the rivendell article on wider tires.

http://www.rivbike.com/node/18

food for thought.
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Old 03-26-07, 11:52 AM   #14
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To be honest, I don't think it's the higher effective gear you're feeling. The difference between 700Cx23 and 700Cx28 is all of 0.4 gear inches! I seriously doubt I'd feel the difference at all, even if I tried.

On the other hand, going from a 16T to a 17T drops your gearing by about 4 gear inches...
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Old 03-26-07, 11:56 AM   #15
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700x23 kenda kontenders with wire bead are 'meh'. 700x23 kenda kontender lites with kevlar bead are the best value/quality/weight tires ever. EVER!
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Old 03-26-07, 12:22 PM   #16
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^ ^ ^ Yes, kevlar rules... If someone decides to shoot my tires from their car, I can rest assured they hopefully won't puncture!
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