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Gearing Help Please ...

Old 07-07-13, 03:09 PM
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6inchelvis
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Gearing Help Please ...

I am new to this forum and need help, I was in the process of building a fixed gear bike from a retro 1980 Bianchi frame I have cleaned up and had shot blasted/powder coated white (looks amazing) problem is I have signed up to do coast 2 castles with some friends (Newcastle to Edinburgh) and I want to do it on the retro Bianchi. So far it's got a shimano bottom bracket fitted with this crankset http://www.fixedgearfrenzy.com/eight...set-160mm.html the frame has down tube shifter fitment and I would like to keep them on the frame (need new ones though as the old ones are badly corroded) so I have been looking at a 10spd cassette as I will need some help on climbs and I am guessing that front crank is not going to help. It looks like I can only get dura ace to handle a cassette this big ? I also want indexed gearing if possible as I have used friction before and don't want to be looking for gears.

Any advice/help would be greatly appreciated
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Old 07-07-13, 03:32 PM
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Well...
I don't even know if there are 10-speed downtube shifters available.
But if there are, I still don't think they're such a hot option for you. 9-speed will give you a lot better bang-for-the-buck and be a lot more available too.

Either way that crankset has to go. It's explicitly stated as needing an 1/8" chain, which isn't compatible with any multi speed cassette.

Not knowing what your friends intends to ride, it gets a bit hard to advise. We don't know how much money you're willing to sink into the project either.
One option would be to go for an Alfine IGH rear wheel. It could be made to play nice with your crank, and you might even be able to use a bar end Alfine shifter and stick on the downtube.
Or pick up a dirt cheap hybrid from Halfords or something, transplant the driveline, then try to source a DT shifter with the correct speeds from Ebay.
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Old 07-07-13, 03:51 PM
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Originally Posted by dabac View Post
Well...
I don't even know if there are 10-speed downtube shifters available.
But if there are, I still don't think they're such a hot option for you. 9-speed will give you a lot better bang-for-the-buck and be a lot more available too.

Either way that crankset has to go. It's explicitly stated as needing an 1/8" chain, which isn't compatible with any multi speed cassette.

Not knowing what your friends intends to ride, it gets a bit hard to advise. We don't know how much money you're willing to sink into the project either.
One option would be to go for an Alfine IGH rear wheel. It could be made to play nice with your crank, and you might even be able to use a bar end Alfine shifter and stick on the downtube.
Or pick up a dirt cheap hybrid from Halfords or something, transplant the driveline, then try to source a DT shifter with the correct speeds from Ebay.
Damn it, really liked the look of the crank, so eBay looks like my next port of call for a crank, rear wheels, cassette, rear derailleur and front derailleur .... Oh and shifters
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Old 07-07-13, 05:06 PM
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So are you building a fixed gear bike or did you change your mind?

if the frame has no derailleur hanger ,. do consider an internal gear hub..

you pick the cog and chainring tooth count , and all the range of ratios, for the other gears

are a % above or below that.
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Old 07-07-13, 09:11 PM
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I'm a bi confused as to whether you're building a single speed fixed wheel bike or changed your mind and want to build a derailleur multi speed.

It's important that you make up your mind, because the crankset takes a 1/8" wide chain and is 100% not compatible with any derailleur chain.

Of course you can probably fit a 3/32" derailleur type chainring on those arms, or change the crankset altogether, but you have to decide what you're trying to build before you go any farther.
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Old 07-08-13, 04:00 AM
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Originally Posted by 6inchelvis View Post
Damn it, really liked the look of the crank, so eBay looks like my next port of call for a crank, rear wheels, cassette, rear derailleur and front derailleur .... Oh and shifters
So...

You're leaning away from the SS/fixie idea, and is going for a multi-gear, derailer equipped bike?

Temporary for the ride, or permanently?

How much are you willing to spend?

Keep in mind that even on Ebay, parts are a lot more expensive than whole bikes. I'd look for either a donor bike, or another bike to do the ride on.
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Old 07-08-13, 04:50 AM
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Shimano makes 10 speed downtube shifters
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Old 07-08-13, 04:53 AM
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Originally Posted by dabac View Post
Well...
I don't even know if there are 10-speed downtube shifters available.
But if there are, I still don't think they're such a hot option for you. 9-speed will give you a lot better bang-for-the-buck and be a lot more available too.
Being as the OP is in the UK (based on their proposed route) the availability of 9 speed road parts is limited to non-existent, the UK doesn't have the NOS situation that going by all the post on BF that the US does.

For sourcing 10 speed downtube shifters, easy http://www.ribblecycles.co.uk/sp/roa...sh460000000000

What no one has mentioned is the rear wheel hub OLD that the OP will most likely have, an 80's frame will most likely be 126mm, current OLD is 130, is the frame good to cold set? should be but that would need to be confirmed.

Knowing what the issue with the down tube fitting are would also be useful, if corroded, wouldn't they have been cleaned during the shot blasting? Or are they removable?
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Old 07-08-13, 04:59 AM
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Originally Posted by jimc101 View Post
Being as the OP is in the UK (based on their proposed route) the availability of 9 speed road parts is limited to non-existent, the UK doesn't have the NOS situation that going by all the post on BF that the US does.

For sourcing 10 speed downtube shifters, easy http://www.ribblecycles.co.uk/sp/roa...sh460000000000

What no one has mentioned is the rear wheel hub OLD that the OP will most likely have, an 80's frame will most likely be 126mm, current OLD is 130, is the frame good to cold set? should be but that would need to be confirmed.

Knowing what the issue with the down tube fitting are would also be useful, if corroded, wouldn't they have been cleaned during the shot blasting? Or are they removable?
Wow, thanks for all the advice !! So to clear a few things up, I was going to go fixie but now I want to turn it into a retro tourer. So it looks like I need what is called a group set? I have seen a few on eBay and would be looking to sink around 250 into the project, does this seem a feasible amount to get it up and running ? I am also going to get a new set of wheels so this might up the cost a little, and I want to keep the frame shifters but have them indexed not friction. I was thinking about a donor bike but I want shiny gearing any advice on what to look out for would be greatly appreciated
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Old 07-08-13, 05:31 AM
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A groupset is the term used for the drivetrain/brakes, on a road bike, that the chainset (crank), shifters, brake levers (or STI), F&R mechs (derailleurs), brakes, cassette & chain.

For the requirements you have already given, you don't need a full groupset, you will need a rear mech, crank, downtube shifters, brake levers & brakes, if you want to go with 10 speed, would be looking at Tiagra for the rear mech, cassette, Dura Ace for the dowtube shifters, as they are you only real choice, KMC for the chain, Tektro for the brakes & levers. The crank could be an issue with the budget, something like this http://www.spacycles.co.uk/products....=m2b0s109p1698 you would need to research what T the chainring should be & what Bottom Bracket.

For wheels this will most likely push the budget to £3-400, would be looking at low end, but not budget, something like Shimano R500/501, or Fulcrum 7's.

What's the state of your bars, seatpost, saddle etc have you accounted for these?

For where to buy, some bargains can be found on ebay, but you will have to be patient, and be aware of the postage charges, for shops, Merlin, Ribble, Wiggle, Chainreaction among many others, and don't discount the German suppliers, Rose, Bike Discount, Bike 24.
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Old 07-08-13, 07:07 AM
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Originally Posted by dabac View Post
Either way that crankset has to go. It's explicitly stated as needing an 1/8" chain, which isn't compatible with any multi speed cassette.
Why? 130mm BCD chainrings for 3/32" chain are surely available.
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Old 07-08-13, 08:07 AM
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Originally Posted by JohnDThompson View Post
Why? 130mm BCD chainrings for 3/32" chain are surely available.
Fine, that chainring has to go if he wants to use a cassette rear.
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Old 07-08-13, 08:44 AM
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@ $250/GBP, budget, you may be looking at lesser level components to get wheels and all ,
at least the rear will be a big chunk of it.

But if the broad ratio set cassette 8 speed will be getting you from place to place , fine..

frame has to be for a derailleur. that Rt dropout hanger .. threaded eyelet ..


NB you can even find 144 bcd current track, but old road size types. in 3/32"

But the teeth are thicker than what the rather thin 10~11 speed chains require
but 8 speed will be Fine..
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Old 07-08-13, 01:40 PM
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Originally Posted by fietsbob View Post
@ $250/GBP, budget, you may be looking at lesser level components to get wheels and all ,
at least the rear will be a big chunk of it.

But if the broad ratio set cassette 8 speed will be getting you from place to place , fine..

frame has to be for a derailleur. that Rt dropout hanger .. threaded eyelet ..


NB you can even find 144 bcd current track, but old road size types. in 3/32"

But the teeth are thicker than what the rather thin 10~11 speed chains require
but 8 speed will be Fine..
Looks like a donor bike would be my best bet after looking around, does it matter what gearing it has on the donor bike ? If I want to keep the downtube shifters. Also the frame has had a front and rear derailleur on before (it had some crappy shimano stuff on it)
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Old 07-08-13, 01:49 PM
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does it matter what gearing it has on the donor bike ? If I want to keep the downtube shifters.
Friction down tube shifters will make up for a mix and match parts.. indexing has to work together as a set.


All depends on your goals..

Ive de speeded old 5 speed freewheel bikes to use just one cog freewheels ,

changed the Dish , made it less ,. and shuffled axle spacers to line the cog and chainring up.
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Old 07-08-13, 02:15 PM
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Originally Posted by Homebrew01 View Post
Shimano makes 10 speed downtube shifters
Indeed they do... (but they're not cheap). There also exist 10sp barend shifters.

Another idea (which I find myself pimping more and more nowadays) is Retroshift; they offer a fricX10 combination.

Also, you don't necessarily need 10sp to get up hills. It may be easier (and cheaper) to use a touring (aka "mountain") RD to get up and down a touring ("mountain") cassette like 11-32? 11-34?. That's what I did. I've got 11-34 and a mountain RD, I startd with a 52/39, but at the moment I have a compact 50/34 on the front. (Needed that to get through the Great Western Loop this past weekend -- my first time ever! ~3600ft climbing over 42mi! Woohoo!)

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