Renovating bike - advice needed

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AMMoffat
Posts: 139
Joined: 1 Dec 2007, 1:05pm

Renovating bike - advice needed

Postby AMMoffat » 14 Mar 2018, 4:27pm

I'm renovating my early 1990s Raleigh Royal touring bike and would welcome some advice on gearing. Currently it is 3 x 7 with a Shimano 12-28 7-speed cassette and a 24-36-46 Shimano SG chainset. I intend to upgrade it to 9 speed (11-34), as the gearing is no longer low enough, and bar-ends as opposed to the current downtube levers. The current system is indexed at the back but not the front and I am happy to keep it that way especially if I can avoid having to acquire a new front mechanism. It will also be getting a re-spray.

New bits I'm expecting to need are a rear hub (or wheel) and derailleur, plus re-spacing the rear drop-outs. I also have the following questions:

1. Will the existing chainset and rings be suitable for use with a 9-speed chain/system as I was hoping to avoid having to replace the chainset and front mech?

2. What should I get the rear drop-outs (currently 126mm) re-spaced to?

3. Any recommendations on which hub, derailleur and bar end levers to get (I was thinking Shimano XTM772 Shadow mech and Shimano Dura Ace 7700 bar end shifters)?

4. Have I missed anythingf?

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speedsixdave
Posts: 636
Joined: 19 Apr 2007, 1:48pm
Location: Nottingham, UK

Re: Renovating bike - gearing advice needed

Postby speedsixdave » 14 Mar 2018, 4:35pm

I have a 1987 Raleigh Randonneur, probably much the same frame as yours in 531st. Mine is also running 9 speed, with a 12-32 cassette on Ultegra hubs so 130mm spacing. The frame will spring naturally to accommodate 130 hubs without much effort at all so this is the easiest route.

135 would allow you to use mountain bike hubs with their hopefully better sealing, and these will build into a stronger wheel with less dish. This is probably worth doing if you're intending to use the bike as a proper loaded tourer. Your choice!
Big wheels good, small wheels better.
Two saddles best!

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531colin
Posts: 12015
Joined: 4 Dec 2009, 6:56pm
Location: North Yorkshire

Re: Renovating bike - advice needed

Postby 531colin » 14 Mar 2018, 5:54pm

Chainset/F. mech will almost certainly be OK.
My experience of 9 speed was that it wasn't as good as I hoped.....there was a horrible jump between 2 sprockets, right where I wanted a small difference. https://forum.cyclinguk.org/viewtopic.php?f=5&t=54328&hilit=nightmare&start=30
Most of my bikes are still 8 speed, with altered cassettes, as in that thread. (slap a 34T on the back, discard the top 2 sprockets, fit a 12T top)
I use 8 speed chains on the one 9 speed bike, its perfectly OK with friction left shift (I've no idea about indexed left shift)
10 speed "Mountain" R. mechs. wont index with 9 speed road levers, but 9 speed mountain R. mechs will.

Brucey
Posts: 29529
Joined: 4 Jan 2012, 6:25pm

Re: Renovating bike - advice needed

Postby Brucey » 14 Mar 2018, 6:22pm

1. the FD will be fine, and if somewhat used (rather than brand new) the chainset will probably be OK with a 9s chain. If there is a problem, it'll be a reluctance to downshift onto the small ring from the middle.

2. For 9s it would be best if you respace to 135mm and buy a suitable hub ( such as LX FH-T670)

3. 7700 bar end levers and RD-M772 will work OK, but you will need to add a barrel adjuster somewhere in the cable run, eg on the 'ergo boss' that you will fit onto the DT bosses.

4. you could save a few quid by throwing the 11s sprocket from an 11-34 cassette into the bin, and fitting the remaining 8 sprockets to a 7s freehub. You will have a 3x8 system with 9s spacing and with the low gears that you want.

There are many possible combinations using a custom cassette BTW; with 9s probably you would be better off with another sprocket in the middle somewhere rather than an 11T sprocket fitted.

cheers
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~~~~~~~~~~~~~~~~~~~~~~Brucey~~~~~~~~~~~~~~~~~~~~~~~~

AMMoffat
Posts: 139
Joined: 1 Dec 2007, 1:05pm

Re: Renovating bike - advice needed

Postby AMMoffat » 14 Mar 2018, 10:10pm

Thanks for the suggestions so far.

Brucey wrote:4. you could save a few quid by throwing the 11s sprocket from an 11-34 cassette into the bin, and fitting the remaining 8 sprockets to a 7s freehub. You will have a 3x8 system with 9s spacing and with the low gears that you want.

There are many possible combinations using a custom cassette BTW; with 9s probably you would be better off with another sprocket in the middle somewhere rather than an 11T sprocket fitted.

cheers


Brucey, if I do what you suggest at 4 do I avoid having to respace the dropouts?

Brucey
Posts: 29529
Joined: 4 Jan 2012, 6:25pm

Re: Renovating bike - advice needed

Postby Brucey » 16 Mar 2018, 7:13am

AMMoffat wrote:Thanks for the suggestions so far.

Brucey wrote:4. you could save a few quid by throwing the 11s sprocket from an 11-34 cassette into the bin, and fitting the remaining 8 sprockets to a 7s freehub. You will have a 3x8 system with 9s spacing and with the low gears that you want.

There are many possible combinations using a custom cassette BTW; with 9s probably you would be better off with another sprocket in the middle somewhere rather than an 11T sprocket fitted.

cheers


Brucey, if I do what you suggest at 4 do I avoid having to respace the dropouts?


pretty much, yes. 7s hubs are 126mm spaced (road) or 130mm or 135mm spaced (MTB). Obviously the latter builds into a stronger wheel.

You can always respace the dropouts at some later date if you deem it necessary.

cheers
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~~~~~~~~~~~~~~~~~~~~~~Brucey~~~~~~~~~~~~~~~~~~~~~~~~