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Can i use a 48T, 38T and 30T on a 105 triple(10 posts)

Can i use a 48T, 38T and 30T on a 105 triplejrm
Sep 15, 2003 7:12 AM
Readthat shimano suggests that you have at least 10T increments between rings. Any thoughts?
re: Can i use a 48T, 38T and 30T on a 105 tripleChen2
Sep 15, 2003 9:25 AM
You'll need triple chain rings from TA Specialties if you want it to shift well. Try Peter White Cycles. I think it's the "Allez" rings that are triple compatible. The middle ring needs to be ramped and pinned for a triple. The front derailleur will need to be adjusted down to clear the big ring by 1 to 2 mm. The curvature of the Shimano derailleur side rails will not be ideal. I think you can make it work. Let us know how it turns out.
~Al
I though this was an issue with DA and Ultegra butOldEdScott
Sep 15, 2003 10:17 AM
NOT with 105. One of the advantages of 105 -- you can run these ratios.
In what way is 105 different than Ultegra to make this work? nmTFerguson
Sep 15, 2003 12:31 PM
If I can find Grant's latest mailer for the Romulus, IOldEdScott
Sep 15, 2003 1:01 PM
think he explains it. He specs 105 for that reason, I think. I'll check when I get home ...
If I can find Grant's latest mailer for the Romulus, IRusty Coggs
Sep 15, 2003 1:13 PM
Grant uses 105 for bang for buck.He use to spec sora on some stuff,but likely got gripes over the preceived cheeziness on such good looking bikes,even tho the stuff was Perersen functional.
it isn't...........nmRusty Coggs
Sep 15, 2003 1:05 PM
Even with 105,shimano says the diference between the middle nd big rig should be at least 10 teeth.Nothing about the small to middle. doubt if it's even that critical with the larger rings. If there was an issue,he could just run a 28 small ring.
Grant's quote:OldEdScott
Sep 16, 2003 7:27 AM
He's talking about smaller (48x36x26 or 46x36x24) chainrings as the more sensible way to go:

"Current racing triple front derailleurs work OK, but they're designed to be used with big rings, and are radiused to to follow the bigger radius of the big ring. Plus, they're too long in the tail. When you set them up properly on a 46-tooth ring, the lower tail hits the chainstay ... Curiously, the Shimano 105 triple is better designed than the fancy Dura Ace triple, which sticks down way too far. It cannot be used with a 48T or smaller big ring on a road bike with a decently low bottom bracket. It forces you to use a 50T or larger chainring."

This is from the summer/fall catalogue.
Grant's quote:Rusty Coggs
Sep 16, 2003 8:17 AM
the remark was with respect to the ultegra triple FD,not DA.FWIW,Grant gets alot of stuff wrong to not quite right.And the question had to do wit a 48 ring.
I am running 48-38-30 on my SurlyAlpedhuez55
Sep 16, 2003 6:53 PM
I am running that on my cross bike. I have not had any issues with it at all. It shifts pretty well for me.

Mike Y.