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Old 02-09-13, 06:05 PM   #1
SlowNeasy
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Advice Wanted on Compact Crank on older Bike.

I have a early 90's Raleigh RT 500 42/53,13-14-15-16-17-19-21 cassette All components Shimano 105. I need to gear this bike down. It is just too hard for me to pedel.(It was Great 20 yr ago)/. Shifters on downtube now set on friction.
At first glance it looks like the easiest way to do this is replacing my 42/53 chainwheel with a compact 34/50t. I saw several affordable ones on Azon.xom like Shimano FC-2350 Crankset.I was planning on overhauling the BB anyway.

Anyone know if a compact crankset will bolt right up to my bike? Any barriers or cautionns up ahead? I read somewhere I might need spacers? between the compact sprockets.

Would a triple compact be even Possible?(without major changes)

Any Advice or Warnings Welcome.

Thanks
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Old 02-09-13, 06:15 PM   #2
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Do you need to replace the entire crankset? Why not just the chainrings? As long as the Bolt Circle Diameter (BCD) is the same you shouldn't have any trouble. Or maybe somebody knows something about the 105 crank that I don't know. I'm a noobie when it comes to new equipment.

110mm is a common BCD, but I don't know what your 105 is. I would recommend 48/34 unless you have any special reason to go with a 52T ring. Go to
http://www.gear-calculator.com
to see how the rings fit into the sprocket spacings.
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Old 02-09-13, 06:46 PM   #3
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I don't think 105 has 110 spacing. I have done this change two ways. 1. I'll start with a 110 spaced vintage double crankset and swap on chain rings from a MTB donor. I've got a 47/35 set up, or something close to it, on my 1986 Katakura. 2. My other builds use modern external bearing setups. One is a Shimano Tiagara I picked up off eBay. It's on my 1987 Prologue, currently 9 speed. I have a similar set up with a Truvativ Elita compact, it's on my 8 speed Paramount series 5.

I really like compact setups, I'll pick up donor MTBs just to get the parts.

While 110 spacing was popular on vintage doubles, not so much on the newer stuff. Too bad, as it limits changes.
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Old 02-09-13, 07:05 PM   #4
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The space between centers on the chainwheel bolts is 3"=(I believe) 129.616 or rounded off BCD 130.
So far the few sprokets I've seen cost more together than compact cranksets.
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Old 02-09-13, 07:19 PM   #5
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And of course I just found two on EvilBay that might fit the bill.LOL

wrk101 have you had any problems with the spacing between the compact chainrings not meshing up with the existing chains or shifters. I didn't know you could foul up a friction shifter
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Old 02-09-13, 07:29 PM   #6
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I put a FSA Gossamer compact set on my old Cannondale. It's great!
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Old 02-09-13, 07:33 PM   #7
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Just found two on EBey that might work.
Wrk101 Have you had any problems with spacing between the compact chainwheels and the old chain and shifters ?
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Old 02-09-13, 07:34 PM   #8
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+1 for the FSA unit. Truvativ also made some very nice compact doubles that used the same 115 square taper BB as your 105 stuff. Velo Orange makes a 110 BCD shiny crankset, square taper, takes a 110 BB, but it comes with a 48 big ring and as you have discovered, 50 tooth big rings can be pricey.

130 BCD rings will get you to a 50/38 (what we call a 'kinda compact'), that's it.
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Old 02-09-13, 07:57 PM   #9
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And of course I just found two on EvilBay that might fit the bill.LOL

wrk101 have you had any problems with the spacing between the compact chainrings not meshing up with the existing chains or shifters. I didn't know you could foul up a friction shifter
You can always run higher speed chain if you want (9 speed). When I have used modern cranksets, I tend to do it on 9 speed bikes. I am running 8 speed chain on one of them, nine on the other. There are various discussions on chain speed choice in the mechanics forum.

And you can always run a vintage touring triple, and just remove the smallest ring.
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Old 02-09-13, 08:33 PM   #10
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And you can always run a vintage touring triple, and just remove the smallest ring.
+1... just be aware that this will increase Q-factor due to the wider BB spindle. I suspect this only bothers me because I know it's wider.
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Old 02-09-13, 09:17 PM   #11
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I put the Velo Orange Grand Cru compact 48/34 crankset on my vintage bike, it looks like it belongs and it functions beautifully.
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Old 02-09-13, 09:18 PM   #12
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I settled on a cold forged sugino compact double 48/34 with 12/26 cassette, works well enough for most any climb. The advantage of the sugino is it uses a traditional bottom bracket, so you can fit the crankset based on the minimum width the frame will accept (with accurate measure of the needed BB width to match your frame). There are all sizes of square taper BB's available. That can't be said for external BB's or any of the proprietary systems.

Still, I'm contemplating a 50/36/24 crank with a 13/24 cassette for the steepest climbs I encounter. Spinning vs mashing is most definitely the way to go.
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Old 02-09-13, 11:11 PM   #13
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Don't overlook the option of a triple, either 130/74 or 110/74 BCD. My experience typically has been you can upgrade to a triple with no change to the BB or derailleurs (no guarantees - YMMV). If you get a 130/74 triple, you can re-use your existing chainrings, so it could be quite economical.
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Old 02-10-13, 12:03 AM   #14
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+1... just be aware that this will increase Q-factor due to the wider BB spindle. I suspect this only bothers me because I know it's wider.
I put a 94bcd LX crank on a 103mm bottom bracket. Q factor appears to be 150-155mm. I think that's alright but it feels too wide I guess still. Bike's getting a Stronglight 49d soon which is X amount narrower. Who knows.
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Old 02-10-13, 01:18 AM   #15
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Um, do you know you can get wider range 7-speed cassettes than the 13-21 you now have? 11-28, 13-26, to name just two. Both Shimano HG50, maybe $30 each. You'll need a longer chain, too.

Less expensive than new cranks.
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Old 02-10-13, 02:17 AM   #16
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Um, do you know you can get wider range 7-speed cassettes than the 13-21 you now have? 11-28, 13-26, to name just two. Both Shimano HG50, maybe $30 each. You'll need a longer chain, too.

Less expensive than new cranks.
+1 A new crank is probably the most expensive way to go... especially a triple.

Get a new RD and MTB cassette...

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Old 02-10-13, 07:24 AM   #17
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Um, do you know you can get wider range 7-speed cassettes than the 13-21 you now have? 11-28, 13-26, to name just two. Both Shimano HG50, maybe $30 each. You'll need a longer chain, too.

Less expensive than new cranks.
Thanks. That was my first idea, but I couldn't find one with a large enough grany gear w/o going to a new RD or so many duplicate/close gearings on a complicated pattern.
I would be happy with a 5 speed 14-34 freeewheel but then new RD and change to a rear freewheel threaded wheel. But that's still a possibility.
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Old 02-10-13, 07:30 AM   #18
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Don't overlook the option of a triple, either 130/74 or 110/74 BCD. My experience typically has been you can upgrade to a triple with no change to the BB or derailleurs (no guarantees - YMMV). If you get a 130/74 triple, you can re-use your existing chainrings, so it could be quite economical.
Please forgive me I don't understand the 130/74. I the 130 the BCD? what is the 74 ?
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Old 02-10-13, 07:34 AM   #19
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+1... just be aware that this will increase Q-factor due to the wider BB spindle. I suspect this only bothers me because I know it's wider.
Once the ring is removed, run a narrower bb.

If you are going to run the vintage triple as a compact double, you need a 110/74. First number is for the middle and large ring, second number is the spacing for the small ring.

Cost is really all about how resourceful you are. If you are just going to go to a bike shop, or order stuff new, then the freewheel is a much cheaper option. I tend to find used parts, often in the form of a complete bike. Takes more time and effort to get the parts, costs a lot less. Its that old time/cost balance.

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Old 02-10-13, 07:37 AM   #20
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I put the Velo Orange Grand Cru compact 48/34 crankset on my vintage bike, it looks like it belongs and it functions beautifully.
I moved a guy from 53/39 DA 7400 to 48/34 V-O, and the chromed crankset fit right in, no problem. He's using his original DA bottom bracket. We moved the FD down just a hair, and took two links out of the chain.

He wanted to "stay Dura Ace" and the triple option in that regard was nigh impossible and cost more than the bike, which is Italian threaded, making it even harder.
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Old 02-10-13, 10:32 AM   #21
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Please forgive me I don't understand the 130/74. I the 130 the BCD? what is the 74 ?
The 130BCD is only for the large and middle ring. This is a common standard for double cranksets. the 74BCD is only for the small chainring. The triple crankset has two BCD specifications.
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Old 02-10-13, 01:09 PM   #22
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The OP's crankset is over-geared for his progressing years. 53/42 double... A cassette isn't the cheapest route as others have pointed out the need to buy a new RD. A 13-21t cassette with the right combo triple will yield a good low gear. I did this with a cross/hybrid w/ an Alivio 22-32-42 triple. I climbed steep hills comfortably.

The 105 crankset is 130mm BCD, and should take a 113-115mm BB spindle. That's long enough for some modern triple cranks that use square-taper BBs.
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Old 02-10-13, 04:40 PM   #23
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The OP's crankset is over-geared for his progressing years. 53/42 double...
No kidding. 53/13 would have been over-geared for me even in my early years! I never mused my n52/14 back then, surely don't need something like that in my "progressing" years.
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Old 02-10-13, 05:56 PM   #24
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Um, do you know you can get wider range 7-speed cassettes than the 13-21 you now have? 11-28, 13-26, to name just two. Both Shimano HG50, maybe $30 each. You'll need a longer chain, too.

Less expensive than new cranks.
+1. A 13-26 cassette would help immensely without requiring any derailleur changes. A 39T inner chainring (also inexpensive) would also be a good idea.
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Old 02-10-13, 07:01 PM   #25
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The OP's crankset is over-geared for his progressing years. 53/42 double... A cassette isn't the cheapest route as others have pointed out the need to buy a new RD. A 13-21t cassette with the right combo triple will yield a good low gear. I did this with a cross/hybrid w/ an Alivio 22-32-42 triple. I climbed steep hills comfortably.

The 105 crankset is 130mm BCD, and should take a 113-115mm BB spindle. That's long enough for some modern triple cranks that use square-taper BBs.
Everyone Thanks for the help

WNG & Old's'cool (and anyone else) I found a Corso Pro, 52-42-30t, 130/74, crank set, says it fits sq taper 113-118mm(two sources) So this should fit right onto my 105 BB? If I need a wider FD no problem.
Can you friction shift a triple ?
Thanks all
Dave.

Last edited by SlowNeasy; 02-10-13 at 07:32 PM. Reason: omision
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