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#1
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Can I use a shimano 105 triple, 9 speed F+R mechs with my 5 cog rear screwon hub?
Sorry Guys, I don't totally get this yet - if I'm going with friction
shifters, can I just use whatever comes to hand? For instance ebay has a chap selling a shimano 105 triple, front and rear mech and BB - could be a potential bargain - can I get this to work with my 5 cog rear hub , assuming the front mech is bottom pull.. If not, what would I need to do - change the rear hub to cassette? Would the wheel need to be redished if I put more cogs on it - Looks like the frame is going to be resprayed so could get it cold set at the same time if need be... Thanks a lot, Emma |
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#2
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"emma" wrote in message oups.com... Sorry Guys, I don't totally get this yet - if I'm going with friction shifters, can I just use whatever comes to hand? For instance ebay has a chap selling a shimano 105 triple, front and rear mech and BB - could be a potential bargain - can I get this to work with my 5 cog rear hub , assuming the front mech is bottom pull.. I can't see why not. If not, what would I need to do - change the rear hub to cassette? Would the wheel need to be redished if I put more cogs on it - Looks like the frame is going to be resprayed so could get it cold set at the same time if need be... To change the hub requires a full rebuild anyway so re-dishing isn't an issue. If you're having the frame repainted and it can be cold set to accept a cassette hub then why not take the opportunity to update. I can see where this started andwhere it's heading: Start...some bargain components available ------- End....mucho squids spent on things you didn't need before ;-) But it'll be like having a new bike for a fraction of the cost I imagine. Pete |
#3
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Thanks Pete. Yes, you are right in your analysis of where this is
heading but the nicer the bike the nicer the ride - and yep, it will be a pretty much new steel 531 to my spec so I thinks its worth it. |
#4
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On 15 May 2005 04:36:57 -0700, "emma" wrote:
Sorry Guys, I don't totally get this yet - if I'm going with friction shifters, can I just use whatever comes to hand? For the derailleur, pretty much, yes. Of the components involved in changing gear the derailleur is basically passive, it simply does what it's told to do. If you are using friction shifters, then it's *you* who controls the amount of cable adjustment delivered, so almost any derailleur will work (as long as the cage has enough capacity for high/low combos). The difference with an indexed setup is that the shifter is designed to deliver a set amount of cable pull per shift (each click), and this amount corresponds to the cog spacing on the cluster of gears at the rear (the cassette). The critical thing here is that the cassette and the shifter are matched, so again the derailleur is essentially a slave. If you wanted to move to an indexed set up, it's not the derailleur you'd need to worry about so much as the gear cluster and shifters. For instance ebay has a chap selling a shimano 105 triple, front and rear mech and BB - could be a potential bargain - can I get this to work with my 5 cog rear hub , assuming the front mech is bottom pull. That bundle will potentially work, you'd need to confirm a couple of things first. Bottom bracket size: he doesn't give a shell width, and that would need to match your frame. It's probably 68mm, which could well be what you need, but that should be checked. You can measure the width very easily, just put a steel rule across that part of your frame where the BB lives; measure accurately from one face to the other. You'll need to ask the seller to confirm the dimension of the BB he is offering. The bottom bracket axle length is 118mm, which suits the triple chainset and is therefore probably close enough to what you will need, but matching older frames with BB lengths can be a bit hit and miss. If it's a little out you might have chainline issues. His front mech is band on with a diameter of 28.6mm, does that match your seat tube? If it doesn't you could always keep your existing front mech and ebay the new one. If not, what would I need to do - change the rear hub to cassette? Would the wheel need to be redished if I put more cogs on it - Looks like the frame is going to be resprayed so could get it cold set at the same time if need be... Your current 5 speed hub is too narrow to use with a modern 8 or 9 speed cassette. If you want to increase the gears at the back you'll need a new wheel with a wider hub, and consequently the frame will need cold setting. You can make this jump now, or at some point in the future. If you buy something like the bundle you've spotted on ebay then it should (provisos above) work fine for the moment, then, when you are ready, you could buy a new wheel and modern cassette. At that time you could also consider buying indexed shifters which would bring you up to a fully modern drivetrain. Alternatively, I think you mentioned you already have everything you need to get up and running except for a rear derailleur? You could just buy a stand alone rear mech and go with that for the moment. "Bob" -- Email address is spam trapped. To reply directly remove the beverage. |
#5
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in message .com, emma
') wrote: Sorry Guys, I don't totally get this yet - if I'm going with friction shifters, can I just use whatever comes to hand? You can use whatever deraileurs come to hand, yes. The triple chainset and the bottom bracket are more of an issue. They probably would fit OK but I would seek advice from a _good_ LBS - probably /after/ cold-setting the frame. -- (Simon Brooke) http://www.jasmine.org.uk/~simon/ [ This mind intentionally left blank ] |
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#7
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"mb" wrote in message t.nl... I would check that the chain is going to fit. I can't say I'm an expert on these things but if it's quite an old 5 speed cassette, then the chain for that may be too fat for the rear mech, etc. Or, the chain for the 105 rear mech may be too thin for the 5 speed cassette. Having said that, there may not be a problem... Good point. The need to replace the chain becomes another excuse to upgrade to cassette :-) Pete |
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