Claud Butler Urraco mods

[DCBassman]

Before I start ripping everything to bits, a quick question: this currently has Acera 3x7 speed transmission. I'm going to 8-speed and much lower gearing. I have the matching 8-speed brake/shifter. Is it possible that the Acera rear derailleur would work across the 8-speed cassette? Would save some work and keep the bike more original...not that this any great consideration.
Then I could put the marginally more fancy Alivio from the Scott onto the Trek, because it deserves it.
Your boundless knowledge appreciated!

 

[Cycleops]

Should work no probs if 8 speed mech and shifters. You can even use the same chain.

 

[DCBassman]

My thinking came from that Alivio mech I put on the Scott. It was rated 7/8 speed, so the Acera ought to cope. Fingers crossed!

 

[Rickshaw Phil]

Yes, it'll be fine. I have an all Acera 3x8 setup and it works well.

 

[DCBassman]

Excellent!

 

[raleighnut]

Same pull ratio.

 

[DCBassman]

It would appear that my plan to use this rd is doomed to failure because it actually doesn't have the capacity to cope eith a 34t max sprocket size. The current low gear is a 28t, and apparently this is a GS rd and I'll need an SGS to deal with the lower ratios.
Bum.
But I have the Alivio from the Scott, so the overall plan can still go ahead.
Of course, an 8-speed 12-28 would work just fine, but that's the limit according to Shimano.

 

[raleighnut]

It would appear that my plan to use this rd is doomed to failure because it actually doesn't have the capacity to cope eith a 34t max sprocket size. The current low gear is a 28t, and apparently this is a GS rd and I'll need an SGS to deal with the lower ratios.
Bum.
But I have the Alivio from the Scott, so the overall plan can still go ahead.
Of course, an 8-speed 12-28 would work just fine, but that's the limit according to Shimano.

Would one of these help,



Gear hanger extension, it should be a linky by clicking on the picture

 

[DCBassman]

Would one of these help,

View attachment 450048

Gear hanger extension, it should be a linky by clicking on the picture

Actually, I have one somewhere, good thinking!

 

[DCBassman]

Found it!