FC-R700 Hollowtech II chainring changeout
06-26-09, 09:51 AM
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FC-R700 Hollowtech II chainring changeout
Help me decide:
Big chainring needs replaced (8K on the crank). Do I break it all the way down and lube the bottom bracket OR do I leave well enough alone?
The crank makes NO noise, not loose BUT it does have 8K on it. Lube it, leave it alone??
In addition, I found a brand new FC-R700 Hollowtech II for $116 and the cheapest replacement chainring was $78 before tax. So I bought the crankset as it is a better deal all around for the money.
Do I just replace my old crankset with the new, or use the new crankset as a piece parts replacement?
Thoughts?
Thanks in advance.........
Big chainring needs replaced (8K on the crank). Do I break it all the way down and lube the bottom bracket OR do I leave well enough alone?
The crank makes NO noise, not loose BUT it does have 8K on it. Lube it, leave it alone??
In addition, I found a brand new FC-R700 Hollowtech II for $116 and the cheapest replacement chainring was $78 before tax. So I bought the crankset as it is a better deal all around for the money.
Do I just replace my old crankset with the new, or use the new crankset as a piece parts replacement?
Thoughts?
Thanks in advance.........
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06-26-09, 12:42 PM
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If it ain't broke, don't fix it. The 7800 bearings are sealed and nearly indestructible.
It probably won't hurt to remove, clean, and put it all back together again with a light layer of grease, as long as you do it properly and reinstall the left crankarm at the proper sequence and torque. (Which basically means you use the little plastic disk-tool to install the dust cover finger tight (not too much though), THEN tighten each allen bolt a half turn at a time, then finish it with a torque wrench to 12-15Nm.)
I say 'probably won't' because if you do anything wrong (and it's not hard to do), you could create problems where none existed before. Good luck.
It probably won't hurt to remove, clean, and put it all back together again with a light layer of grease, as long as you do it properly and reinstall the left crankarm at the proper sequence and torque. (Which basically means you use the little plastic disk-tool to install the dust cover finger tight (not too much though), THEN tighten each allen bolt a half turn at a time, then finish it with a torque wrench to 12-15Nm.)
I say 'probably won't' because if you do anything wrong (and it's not hard to do), you could create problems where none existed before. Good luck.
06-26-09, 02:31 PM
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I am surprised that you wore out a big chainring in 8k miles! What kind of conditions do you ride in?
Heck, I have a bike that I will not allow to get wet or dirty and I have 6500 miles on the Ultegra chain with VERY little stretch. I do clean and oil it every week.
Heck, I have a bike that I will not allow to get wet or dirty and I have 6500 miles on the Ultegra chain with VERY little stretch. I do clean and oil it every week.
06-26-09, 04:07 PM
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If it ain't broke, don't fix it. The 7800 bearings are sealed and nearly indestructible.
It probably won't hurt to remove, clean, and put it all back together again with a light layer of grease, as long as you do it properly and reinstall the left crankarm at the proper sequence and torque. (Which basically means you use the little plastic disk-tool to install the dust cover finger tight (not too much though), THEN tighten each allen bolt a half turn at a time, then finish it with a torque wrench to 12-15Nm.)
I say 'probably won't' because if you do anything wrong (and it's not hard to do), you could create problems where none existed before. Good luck.
It probably won't hurt to remove, clean, and put it all back together again with a light layer of grease, as long as you do it properly and reinstall the left crankarm at the proper sequence and torque. (Which basically means you use the little plastic disk-tool to install the dust cover finger tight (not too much though), THEN tighten each allen bolt a half turn at a time, then finish it with a torque wrench to 12-15Nm.)
I say 'probably won't' because if you do anything wrong (and it's not hard to do), you could create problems where none existed before. Good luck.
I don't know how to respond to your....thoughts.....I ride in near ideal conditions (SoCal). I go through chains about every 2666 miles.......on my second cassette now, it's getting close though....maybe I hammer harder than you??
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