Changing the gearing on an Avanti Metro 8c

Questions about purchasing bicycles and parts

Re: Changing the gearing on an Avanti Metro 8c

Postby MattyK » Mon Oct 29, 2012 10:39 am

Triple: http://www.bike24.com/1.php?content=8;n ... pgc=69:235

Search for trials cranks:
http://www.onza.com/components/drivetra ... nkset.html
http://www.tartybikes.co.uk/cranksets/o ... 10079.html
24T is a common trials size. With a (common) 20T sprocket that would be basically the same ratio as 26-22.

You will probably lose your chain guard. If you want to keep it, you could cut your existing chainring and adapt a custom ring onto the 3 holes for that small ring.
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by BNA » Mon Oct 29, 2012 10:51 pm

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Re: Changing the gearing on an Avanti Metro 8c

Postby Biffidus » Mon Oct 29, 2012 10:51 pm

Hrm that could work.

What's the bet my local charges $70+ for those cranks :(
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Re: Changing the gearing on an Avanti Metro 8c

Postby MattyK » Tue Oct 30, 2012 11:09 am

UK shipping is usually pretty good.

Further thoughts though:
http://www.tartybikes.co.uk/cranksets/o ... 10079.html
Looking at the inside of those cranks, they look like a MTB triple with a bashring outer, no middle and the 24T on the inner position. (Manufacturer stamps says Lasco.)
This would kind of make sense because the Tarty bikes site suggests that trials guys typically use a very long BB (~128mm), which I assume would be necessary to get the chainline right when using just the inner ring -see the Questions for that product: http://www.tartybikes.co.uk/cranksets/o ... tions#q106
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Re: Changing the gearing on an Avanti Metro 8c

Postby Biffidus » Tue Oct 30, 2012 5:35 pm

Very cool looking but $80 delivered.

I think I'll watch ebay for a cheap triple crankset with removable chain rings.
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Re: Changing the gearing on an Avanti Metro 8c

Postby Biffidus » Mon May 13, 2013 8:08 am

Update: Just in case others find this thread while trying to do something similar...

A friend pointed me to the Dutch Bike Bits website where I found a set of 33T square taper Shimano Cranks to replace the no-brand 38T (shipping was a little high but I found the same thing on Ebay for $44 delivered). A 24T rear sprocket will get me the rest of the way there.
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Re: Changing the gearing on an Avanti Metro 8c

Postby MattyK » Mon May 13, 2013 1:44 pm

16 euro here: http://www.rosebikes.com/article/shiman ... aid:287959

Have you got the recommended BB for it too? (118mm)
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Re: Changing the gearing on an Avanti Metro 8c

Postby Biffidus » Wed May 15, 2013 11:25 pm

I'm using the original bottom bracket. Everything seems to line up.

Edit: That's 16 Euros plus at least 9 for shipping. Only about $10 difference at most and I got it in 2 days!
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