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  1. #1
    transport, not sport.
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    20t chainring, who needs 'em? I do!

    right after i got myself a rigid steel 29er, some folks here who are not so familiar with 29ers, would comment: "this thing is heavy to ride uphill!"
    they might have misunderstood. maybe it is heavy, when equipped with the gearing of 26" wheel, since 29er has bigger diameter than 26.
    so i searched the net, and found some nice threads about low gearing for 29ers.
    i am aware that one option is to get the 11-36t cassette sprockets.
    but i am a cheapskate. so i looked the other way. i looked at the option of putting a smaller chainring.
    at the local market, someone is selling new old stock 42-32-20 crankset. $40. but still it's expensive for me.
    and then i found a thread of 20t chainring conversion.
    wow. stambeco mountain goat 20t. actiontec. still expensive.
    so i decided to make my own.
    took a $1 20t steel cog. ground the teeth manually to make it thinner to accomodate 8sp chain. drilled 4holes bcd64(?). and put that on my existing $20 FSA crankset, replacing the 22t.
    there were some more grinding of the spider to give more chain clearence, just like it was explained in the 'stambeco 20t chainring conversion' thread.
    voila! now i have low gearing of 17 gear inch. 20t chainring with the 34t sprocket.
    17 gear inch on my rigid steel singular swift.
    thank you all for your inspirations on the internet!

  2. #2
    Senior Member Dilberto's Avatar
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    You just fitted gearing slower than you can walk the bike!
    2001 Cannondale Bad Boy Ultra - Shimano XTR/SRAM X0; Magura, Velocity Blunt SL
    2012 Trek Superfly 100 Pro - SRAM XX; Bontrager RXXXL; Easton Haven; Rock Shox SID XX

  3. #3
    Whistler-bound dminor's Avatar
    Join Date
    Oct 2004
    Location
    The 509
    My Bikes
    1971 Suzuki TS125/ factory race kit/AHRMA-legal; 1969 Suzuki TS250/factory race kit; 1967 Suzuki K-15 Hillbilly Trail 80; 1977 Yamaha IT175; 1964 VanTech Scrambler racing frame
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    Love hearing stories of shade-tree fabs and mods. Way to improvise, tkw

  4. #4
    Senior Member 009jim's Avatar
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    Feb 2008
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    Australia
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    Giant CRX3, Trek 7100
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    My second bike has a chain-ring of equal size to the granny sprocket on the rear cluster. I'm finding I like that more lately. I am in a hilly area and it means I can ride up the hills rather than walk. Walking hurts my ankle so, yeah, I like it!

  5. #5
    Junior Member
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    Good thread - I'm wondering about 26 vs 29 just for the lower resulting gearing on the 26. I'm in no hurry and have steep climbs.

  6. #6
    Bicyclerider4life
    Join Date
    Aug 2006
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    Florida and Idaho
    My Bikes
    Huffy Beach Cruisers, Miami Sun Trike, Vertical PK7, KHS Montana Summit, Giant Cypress DX, Schwinn OTC Stingray
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    20 tooth?!? Heck, I want an 18 tooth crank ring for my touring mountain bike conversion/upgrade. It might be "slower than I can walk" but I don't like walking up hills and I'll be pulling a trailer.
    "Whenever I see an adult riding a bicycle, I know there is hope for mankind." (H. G. Wells)

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