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PostPosted: Wed May 16, 2012 7:22 pm 
Dirt Disciple

Joined: Tue Apr 19, 2011 8:56 pm
Posts: 70
Location: Gosport
Has anyone tried to change a Cannondale Bad Boy WhiteEdition Solo Ultra to use a dual chainset?

It has no derailiuer hanger and is bolt axle amongst other things, I guess it would need an old school mech to take up any slack in the chain.

Just a bad idea?

Girlfriend uses the bike and it involves a monster hill with the 8 Speed Alfine isn't geared for...

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PostPosted: Wed May 16, 2012 8:06 pm 
Gold Trader / rb Rider / Special
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The problem i can think of would be chainline issues causing premature wear.


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PostPosted: Wed May 16, 2012 9:29 pm 
aka Leo Swayer
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Just fit a smaller front chainring?


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PostPosted: Wed May 16, 2012 11:16 pm 
Dirt Disciple

Joined: Tue Apr 19, 2011 8:56 pm
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Location: Gosport
cyfa2809 wrote:
The problem i can think of would be chainline issues causing premature wear.


That's a point but hopefully with only 2 rings on the front it won't be so bad


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 Post subject: Re: .
PostPosted: Wed May 16, 2012 11:20 pm 
Dirt Disciple

Joined: Tue Apr 19, 2011 8:56 pm
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Location: Gosport
Grannygrinder wrote:
Just fit a smaller front chainring?


The gearing is fine apart from the hill, going to a single smaller ring won't help as the commute is 7 miles each way


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PostPosted: Thu May 17, 2012 8:02 am 
Retro Guru
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Location: Platsa, Messinias, Greece
azraelazrael wrote:
Grannygrinder wrote:
Just fit a smaller front chainring?


The gearing is fine apart from the hill, going to a single smaller ring won't help as the commute is 7 miles each way


I'm running an Alfine with 32:23 gearing and (if I wanted to) I could easily commute seven miles on it and climb probably any road hill in existence too.
How steep/long is this hill anyway?

Easiest options are either lower the overall gearing and learn to spin higher cadences or else MTFU (WTFU? :?) on the climbs.
If either option is deemed to be not possible then fitting an Alfine 11 hub instead is another option.


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PostPosted: Thu May 17, 2012 9:29 am 
Gold Trader
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Place I used to work had a bike in their range that was precisely this.

Never saw the point of it myself as the Alfine chain tensioner was basically a rear mech - but it worked fine.


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PostPosted: Thu May 17, 2012 10:54 am 
MacRetro rider
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If the hill is really that bad tell her to take a less direct route if possible as traversing a hill or going around it can be quicker and is usually less effort than going over.


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PostPosted: Thu May 17, 2012 1:40 pm 
retrobike rider
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Location: A wretched hive of scum and villainy...
Pricey (£450ish) but you could get a Sclumpf MountainDrive to replace the chainset and BB. It would last a lifetime of bikes, though.

1:2.5 dual speed gearbox for the front...

Image

Or a Truvativ Hammerschmidt, a bit cheaper (£350), but hardcore DH:
Image

All the best,


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PostPosted: Thu May 17, 2012 2:01 pm 
retrobike rider / Gold Trader
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Nice bike.. I have the same. I don't think you could fit a front mech as there is no rear mech hanger for a chain tensioner; the ECC is for a fixed drive-chain.


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