Upgrading old SIS 5 speed with 7 speed shifters?

pteknae
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Upgrading old SIS 5 speed with 7 speed shifters?

Postby pteknae » Mon Apr 09, 2018 4:15 pm

Hey all,

I picked up a fixer upper vintage mountain bike, Shimano SIS 5 Speed (3x5) with the old friction shifters seen here: https://ssli.ebayimg.com/images/g/CS4AAOSw1RVagy4O/s-l640.jpg.

I bought some 7 speed ST-EF51 shifters from ebay thinking the cassette was a 7 speed, would they work with the 5 speed derailleur?

Also, it appears they're fake. Does anyone know if counterfeit gear will still work the same-ish? Anything is better than the rusty old friction shifters.

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find_bruce
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Re: Upgrading old SIS 5 speed with 7 speed shifters?

Postby find_bruce » Tue Apr 10, 2018 1:20 pm

There was a small difference in spacing between 5 & 7 speed- 5 speed is 5.3 mm while 7 speed is 5 mm.

The ST-EF51 is an index shifter, & while the difference means it is sub-optimal, if you have already spent your money, you might as well hook it up & see if you can get it to work.

As for fake, its a lottery - might work, might not, only one way to find out

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Duck!
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Re: Upgrading old SIS 5 speed with 7 speed shifters?

Postby Duck! » Tue Apr 10, 2018 1:32 pm

The indexing won't work nicely due to the shorter gear stops, and will get progressively worse further across the cassette as the discrepancies accumulate. Just chuck a 7-sp. freeheel cluster in place of the 5-sp.
I had a thought, but it got run over as it crossed my mind.

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find_bruce
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Re: Upgrading old SIS 5 speed with 7 speed shifters?

Postby find_bruce » Tue Apr 10, 2018 1:37 pm

That's the joy of 5 speed duck - set it up on 3rd gear & the indexing only has to work for 2nd & 4th - 1st and 5th are covered by the limit screws

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10speedsemiracer
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Re: Upgrading old SIS 5 speed with 7 speed shifters?

Postby 10speedsemiracer » Tue Apr 10, 2018 5:54 pm

Can you not do a return/trans dispute via eBay, i.e. the item wasn't what it purported to be? Or contact the seller, and indicate you want to return them as not suitable/not as advertised....if the seller is a long-term eBay presence with a lot of feedback, they will care about negative.
Mmm, SunTour

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10speedsemiracer
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Re: Upgrading old SIS 5 speed with 7 speed shifters?

Postby 10speedsemiracer » Tue Apr 10, 2018 6:03 pm

Oh and those shifters you linked to as being the originals aren't friction, they're early-gen index. Just replace them with a newer equivalent, like :

Image

which are available online for $20-30, but LH shifter (friction) is separate usually. SJS Cycles (UK) have them, plus they're freely available on eBay.
Mmm, SunTour

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Duck!
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Re: Upgrading old SIS 5 speed with 7 speed shifters?

Postby Duck! » Tue Apr 10, 2018 7:05 pm

What gives you the impression the shifters are fake?
I had a thought, but it got run over as it crossed my mind.

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Re: Upgrading old SIS 5 speed with 7 speed shifters?

Postby Duck! » Tue Apr 10, 2018 7:07 pm

find_bruce wrote:That's the joy of 5 speed duck - set it up on 3rd gear & the indexing only has to work for 2nd & 4th - 1st and 5th are covered by the limit screws

Still doesn't address the fact that the index stops are shorter than the sprocket spacing, and will still accumulate the out-of-whackness at each shift.
I had a thought, but it got run over as it crossed my mind.

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Re: Upgrading old SIS 5 speed with 7 speed shifters?

Postby twowheels » Tue Apr 10, 2018 7:47 pm

Duck! wrote:What gives you the impression the shifters are fake?

My question also.

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10speedsemiracer
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Re: Upgrading old SIS 5 speed with 7 speed shifters?

Postby 10speedsemiracer » Tue Apr 10, 2018 8:11 pm

twowheels wrote:
Duck! wrote:What gives you the impression the shifters are fake?

My question also.


I was also wondering....
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pteknae
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Re: Upgrading old SIS 5 speed with 7 speed shifters?

Postby pteknae » Sat Apr 14, 2018 11:02 am

Thanks for the help guys, I guess it'll probably work (just) but wont be worth the effort for sub-optimal performance.

I actually just tightened the cable using the threaded tension-er on the derailleur and it shifts great now.



Duck! wrote:What gives you the impression the shifters are fake?


The print on the numbers and logo is faded and not clean or crisp, and the orange gear indicator is a poorly stuck on sticker, which ever Asian sweat shop worker put it on didn't even stick it on properly, its got a crease in it and is wonky.

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