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#1
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Are Shimano chainrings interchangeable?
I have a Shimano 600 set on my road bike (vintage 1987) which I would
like to upgrade the cahinrings from the Bio Pace system that was introduced that year. I would like to change it for a Shimano Ultegra 39T/53T chain rings. Will the 5-hole shimano cetner spacing be the esame for all of their components? |
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#2
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Are Shimano chainrings interchangeable?
Caleb wrote: I have a Shimano 600 set on my road bike (vintage 1987) which I would like to upgrade the cahinrings from the Bio Pace system that was introduced that year. I would like to change it for a Shimano Ultegra 39T/53T chain rings. Will the 5-hole shimano cetner spacing be the esame for all of their components? Your crank has a 130mm BCD (bolt circle diameter). Any chinrings using that standard, including the ones you're asking about will fit. |
#3
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Are Shimano chainrings interchangeable?
search tech archives to - CRANK SAVER!
'87! been a long time: off course if the 600 is like new then it's like new - maybe but the 600 is beatifull. nice. pleasing to look at. ohm the other tapir - nashbar is selling a complete new unit for $60 brinmging the inpemetrabble question! iza nashbar 2006 alloy the equal of a '87 shimano alloy? and remememember - 1.7 times the center to center bolt hole distance equals the BCD ...--..? |
#4
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Are Shimano chainrings interchangeable?
While we are on the subject. I have thought about upgrading the
Shimano 600 down-tube shifters to a handlebar configuration. My 600 system has a 6-speed gear sprocket in the back with 600 SIS (index). Most of what I see out there today is 7+ gears cassettes. Is there any Shimano handlebar shifters out there that can be adapted? Maybe the Ultegra? The background of the proble is that it is difficult to convert the entire component set, the bigger cassette needs a wider backstay. I don't want to mess with the width of the backstay because it can ruin the frame. Any Suggestions? |
#5
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Are Shimano chainrings interchangeable?
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#6
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7 vs. 6 sp shifting, was Are Shimano chainrings interchangeable?
On Fri, 19 May 2006 11:20:20 -0700, Caleb wrote:
While we are on the subject. I have thought about upgrading the Shimano 600 down-tube shifters to a handlebar configuration. My 600 system has a 6-speed gear sprocket in the back with 600 SIS (index). Most of what I see out there today is 7+ gears cassettes. Is there any Shimano handlebar shifters out there that can be adapted? Maybe the Ultegra? The background of the proble is that it is difficult to convert the entire component set, the bigger cassette needs a wider backstay. I don't want to mess with the width of the backstay because it can ruin the frame. Any Suggestions? Try barend shifters, or mounts to convert your downtube shifters to barends. IIRC, 7sp shifter will shift a 6sp cassette/freewheel, as the spacing is the same. So you could use Shimano 7sp shifters, or Campy ones if you switched to a Campy derailer too. You could also convert to 7, 8, or 9 speed, without spreading the frame, by running a wheel with more dish. A lot of people have done this with no problems. The asymmetric rims available now would help even the tension. If your frame is steel there's no reason not to spread it, other than not having a local mechanic who knows how to do it. Your situation was common several years ago, as many people were trying to upgrade their downtube 6sp bikes to STI/Ergo/etc. I wonder if someone has put together a FAQ. Matt O. |
#7
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Are Shimano chainrings interchangeable?
Caleb wrote: While we are on the subject. I have thought about upgrading the Shimano 600 down-tube shifters to a handlebar configuration. My 600 system has a 6-speed gear sprocket in the back with 600 SIS (index). Most of what I see out there today is 7+ gears cassettes. Is there any Shimano handlebar shifters out there that can be adapted? Maybe the Ultegra? The background of the proble is that it is difficult to convert the entire component set, the bigger cassette needs a wider backstay. I don't want to mess with the width of the backstay because it can ruin the frame. Any Suggestions? I assume you're asking about Shimano bar-end shifters: http://www.nashbar.com/profile.cfm?&sku=12434 Back when these first came out (1990-ish), the 6-speed and 7-speed shifters were the same. Since 6-speed required a different cable pull, there was a small plastic shim that fit in the groove of the shifter to make them index properly. The 6/7-speed shifters are almost impossible to find now (they haven't been made for nearly ten years) *and* you would have to find a set *with* the little plastic shim. Double-nearly impossible IMHO. (I have a couple sets of 7-speed bar-end shifters- but I'm not selling them.) Your best bet to retain your existing drivetrain would be to use non-index "friction" shifting, either with Shimano or Silver brand shifters: http://www.rivbike.com/webalog/shift...urs/17089.html This isn't really a step backward- most people can use friction shifters with only a short learning period. As to your question about widening your frame "ruining" your frame- that's hogwash. You would only need to widen it 4mm, a very small amount. I've done it to a couple frames with no ill effects. This Harris Cyclery article gives you a good run-down on the procedu http://www.sheldonbrown.com/frame-spacing.html It would be easy to re-space your frame to 130mm width. Then you could "upgrade" to 8, 9, or 10 speeds on the rear wheel! Jeff |
#8
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Are Shimano chainrings interchangeable?
nashbar and loosescrews sell the requisite equipment
as does the local flea market man!! the two sets downtube shifters i have are from 10 speeds at 2/5/10 but handle 2//8/16 no problem |
#9
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Are Shimano chainrings interchangeable?
gnaw - loosescrews has the rings but i commute and HD tour so the extra
finesse is wasted on me - practically if not asthetically steel is real - what i would like to find is a box of high end late '80's SR steel cranksets in 175mm - now that's anicea crankset - word here is these SR's are $250+ of machining - see the loosescrews special at $175 - a plainjane set - homely - i have one and keep it hidden under the bearing cloth the unworn 600 and another set were replaced with 9 speeds by various rich folk have yawl visited the sugino (italy) site? i haven't for a while but have not located a dealer willing to order tho bike mag had a sidebar on sugino triples a ways back at $100 the AL rings require every day cleaning before commuting to develop a sense of longevity - for the CR if not I |
#10
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Are Shimano chainrings interchangeable?
Caleb wrote: While we are on the subject. I have thought about upgrading the Shimano 600 down-tube shifters to a handlebar configuration. My 600 system has a 6-speed gear sprocket in the back with 600 SIS (index). Most of what I see out there today is 7+ gears cassettes. Is there any Shimano handlebar shifters out there that can be adapted? Maybe the Ultegra? The background of the proble is that it is difficult to convert the entire component set, the bigger cassette needs a wider backstay. I don't want to mess with the width of the backstay because it can ruin the frame. Any Suggestions? First of all, check your frames rear spacing. It's most likely 126mm, which means switching to 7SP only requires re-dishing the rear wheel (a 7SP FW takes up more space on the right side than a 6SP), not messing with the frame. Now, what do you mean by "handlebar configuration" shifters? Do you mean the integrated brake/shifter levers from Shimano? If so, if you convert to 7SP, you may be able to find some of the older 7SP "brifters" through an LBS, RBM or eBay. I would approach used brifters with a great deal of caution. And here are two other approaches, usable in 6 or 7 speed: Kelly Take-offs: http://tinyurl.com/b4z48 and Dia-Tech bar-end shift mounts from Rivendell: http://tinyurl.com/d6tw5 HTH |
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