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PostPosted: Mon Oct 15, 2012 5:20 pm 
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I'm looking at my options to switch my Bob Jackson from SS/fixed to geared. It's not got any brazed-on bosses for shifters, instead a pretty little wedge for a band-on shifter to nestle against. Are there any band-on shifters that are indexed or are they all friction?

Next question that is related: Rear spacing is 125mm or thereabouts. I was going to go for a 5-speed screw-on block, which is most likely what the bike would have originally had. Are 6-speed blocks the same width or wider than a 5? Are the gears spaced the same i.e. if I were to use an indexed shifter would it shift both a 5 and a 6 or are the spaced differently?

I'll probably stick with 5 gears, mainly because I already have one in my box ready to use. I'm also not interested in spreading the rear stays or using more-modern cassette systems, simply because I've got my hubs and rims ready to build up - just looking into gear options.

Ta muchly folks!


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PostPosted: Mon Oct 15, 2012 6:04 pm 
retrobike rider / Gold Trader
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shifters can be unscrewed from some shimano band ons and replaced with indexed ones - a friend's bike has exactly this


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PostPosted: Mon Oct 15, 2012 6:13 pm 
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Jonny69 wrote:
Are there any band-on shifters that are indexed or are they all friction?


Brand new, yes.


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PostPosted: Mon Oct 15, 2012 6:15 pm 
Dirt Disciple
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Joined: Wed May 16, 2012 8:28 pm
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Location: Seattle, WA USA
cce wrote:
shifters can be unscrewed from some shimano band ons and replaced with indexed ones - a friend's bike has exactly this


Yes, once you have your desired clamp band with bosses, index levers can be used. I've done so with some 6 speed Shimano levers.

Sheldon browns excellent site should tell you everything you want to know about gear cluster spacing. Www.sheldonbrown.com

Good luck.


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PostPosted: Mon Oct 15, 2012 6:20 pm 
King of the Skip Monkeys
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Shimano band-on indexed shifters have been around for years. Mostly 6spd but they are interchangeable with any shimano shifter including 10spd.

Image


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PostPosted: Tue Oct 16, 2012 1:01 pm 
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Excellent news then! Many thanks!


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PostPosted: Thu Oct 18, 2012 12:10 pm 
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With regard to your second question, your OLN is just a mm shy of the old 6-block requirement of 126mm, your call as to whether you wan't to squeeze one in. Another alternative is an old 'compact-6', designed to fit in the same space as an old '5'.

Photo shows a Sun Tour Winner compact-6 side-by-side with an AFAIK non-compact Shimano 600 '5'.

Image


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PostPosted: Mon Oct 22, 2012 1:20 pm 
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1mm is fine, I just didn't want to spread it 5mm or more because the angle of the derailleur goes out and it's notchy when you use it. Cheers for the pic.


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