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  1. #1
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    smaller chainring for Spawn Banshee... need smaller bolts?

    I'm hoping someone can point me in the right direction here... I'd like to try a smaller chainring on my son's new Spawn Banshee. We live in Vermont, all trails go up. The stock 28 tooth is OK on flats, but I'd like to swap a 22 or 24 tooth on there and see if it helps him be able to ride more of the trail.

    I had a Shimano 22 tooth from one of my old bikes in the spare parts box, so I pulled the crank, took off the 28 and lined up the 22. Holes are in the right spot, 64 BCD. BUT the chainring bolts/nuts are too wide to fit through the chain ring. The 22 must be designed to just have the "bolt" go through it, right into the spider/crank- but in the Banshee there is a spacer, a thin bashguard, then the spider/crank, so it uses the bolt and the receiving nut that has a wider diameter.

    So, can I get smaller chainring nut/bolt combos to fit through the hole in the 22t? Or can I get a 22/24/26 tooth chain ring with the larger diameter bolt hole? I've looked around the web a bit for 64bcd single speed chainrings (thinking they'd have normal size holes) but didn't see anything so small.

    Any advice would be greatly appreciated! I am also working on a 3 sod set up for the rear like several others have done. Currently building up a wheel with new hub to take the 3 spd free wheel. But that is a whole other story.

  2. #2
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    Couldnt you drill out the holes larger on the 22t chainring so that the banshee bolt hardware will work with it?

  3. #3
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    thanks Grayjay, you are right- I might just have to buy the right size drill bit and go to town on it. I was hoping I was missing something and I could just buy a $5 bag of the right size nuts/bolts and be good. We are planning a ride for the weekend, so the drill press is looking like a better option every minute!

  4. #4
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    smaller chainring for Spawn Banshee... need smaller bolts?

    Standard stuff. I just put the bolt (15mm) from inside with nut (10mm) on outsidesmaller chainring for Spawn Banshee... need smaller bolts?-imageuploadedbytapatalk1370547689.559265.jpg

  5. #5
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    Quote Originally Posted by FreeHeelFreeRide View Post
    thanks Grayjay, you are right- I might just have to buy the right size drill bit and go to town on it.
    If you want to enlarge an existing hole, you either want a manual reamer or a step drill-bit. A standard drill bit is almost impossible to keep centered in the existing hole. Since the spider is pretty thin, you can probably get by with an $8 taper reamer, though you might need a file to clean up the taper.

    Step drill-bit:
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    Taper reamer:
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    Straight reamers:
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  6. #6
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    doh- I feel silly. thanks adamm3, I switched them around. The nut is just a hair longer than the combo of crank/bash/spacer/chainring, but I think a small washer will let me tighten it all down nicely. Much appreciated.

  7. #7
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    Glad you had this problem first. My cranks from Spawn arrived today and I would have had the same problem if I hadn't read this thread first. Cheers!

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