Today I was removing the chainrings from my new Shimano Ultegra crankset, the FC-6500 model. It wasn't until I had the last chainring bolt off that I realized that very thin washers were dropping from the crankset as I removed the chainring nuts and bolts. Because I wasn't paying attention I'm not sure where these things go. It *looks* like they go under the head of the bolt, but none of the Shimano literature that came with the crankset or that I can find online shows these washers. Am I correct in placing these washers under the bolt head?
Today I was removing the chainrings from my new Shimano Ultegra crankset, the FC-6500 model. It wasn't until I had the last chainring bolt off that I realized that very thin washers were dropping from the crankset as I removed the chainring nuts and bolts. Because I wasn't paying attention I'm not sure where these things go. It *looks* like they go under the head of the bolt, but none of the Shimano literature that came with the crankset or that I can find online shows these washers. Am I correct in placing these washers under the bolt head?
No, those are spacing adjustment washers, probably .1 mm thick. They go between either the spider arms and either the outer or middle chainring, to put them slightly farther apart.
It doesn't matter whether they go inside or outside the spider, just so that all 5 of 'em are on the same size.
Thanks for the info. Are these washers put there by Shimano to adjust for a too-thin spider? I know my old Ultegra crank *didn't* have these washers.
I ask because I removed the chain rings from the new crank to put them on the old crank, and now I'm not sure if I should use the washers or leave them with the new crank.
Thanks.
Tom Young
Sheldon Brown <[email hidden]> wrote in message news:<[email hidden]>...
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Tom Young said:
Hi all:
Today I was removing the chainrings from my new Shimano Ultegra crankset, the FC-6500 model. It wasn't until I had the last chainring bolt off that I realized that very thin washers were dropping from the crankset as I removed the chainring nuts and bolts. Because I wasn't paying attention I'm not sure where these things go. It *looks* like they go under the head of the bolt, but none of the Shimano literature that came with the crankset or that I can find online shows these washers. Am I correct in placing these washers under the bolt head?
No, those are spacing adjustment washers, probably .1 mm thick. They go between either the spider arms and either the outer or middle chainring, to put them slightly farther apart.
It doesn't matter whether they go inside or outside the spider, just so that all 5 of 'em are on the same size.
Tom-<< Today I was removing the chainrings from my new Shimano Ultegra
Quoted message said:
crankset, the FC-6500 model. It wasn't until I had the last chainring bolt off that I realized that very thin washers were dropping from the crankset as I removed the chainring nuts and bolts.
Quoted message said:
Quoted message said:
<BR><BR>
Under the small ring, between the small ring and the crank arms. Why some 6500 cranks have 'em and some don't is a mystery to me...
Peter Chisholm Vecchio's Bicicletteria 1833 Pearl St. Boulder, CO, 80302 (303)440-3535 vecchios.comvecchios.comOpen ↗ "Ruote convenzionali costruite eccezionalmente bene"
Thanks for the info. I posted a follow-up question to Sheldon Brown's reply to my original post asking if these washers compensated for too-thin mounting points on the spider. I removed the chain rings from the new crank as I was going to use them on my old Ultegra crank and I wasn't sure if the washers should follow the chainrings or remain behind with the new crank.
I answered my own question by measuring the thickness of the chain ring mounting points on the old and new crank. The new crank's mounting points were thinner than the old crank's mounting points by about 9 thousands of an inch, just about exactly as thick as the washers. So now we both know what these washers are for!
I'd say Shimano is doing a disservice to its customers by not mentioning this.
Thanks again.
Tom Young
[email hidden] (Qui si parla Campagnolo) wrote in message news:<[email hidden]>...
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Tom-<< Today I was removing the chainrings from my new Shimano Ultegra
Quoted message said:
crankset, the FC-6500 model. It wasn't until I had the last chainring bolt off that I realized that very thin washers were dropping from the crankset as I removed the chainring nuts and bolts. >><BR><BR>
Under the small ring, between the small ring and the crank arms. Why some 6500 cranks have 'em and some don't is a mystery to me...
Peter Chisholm Vecchio's Bicicletteria 1833 Pearl St. Boulder, CO, 80302 (303)440-3535 vecchios.comvecchios.comOpen ↗ "Ruote convenzionali costruite eccezionalmente bene"
