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Shimano R600 long reach brake retrofit(4 posts)

Shimano R600 long reach brake retrofitMrDan
Jun 30, 2003 7:43 PM
I have a '78 vintage bike I still ride. Love the thing, but would like to put these long reach dual pivots on in place of the original shimano 600 side-pulls. Problem is that since this is a vintage bike it doesn't use recessed mounting, and Sheldon Browns web-site says these are for recessed mounting. Looked on the Shimano site for dimensions etc. but could not find anything. Anyone familiar with these or could take a measurment of the mounting bolt length for front and rear calipers? I could counterbore the existing brake bolt hole on the fork I guess, and I assume the rear does not need anything special since it seems silly that the rear would use recessed mounting since the brake bridge width is small compared to the front fork.

ANy help/info here GREATLY appreciated...
re: Shimano R600 long reach brake retrofitRusty Coggs
Jul 1, 2003 4:58 AM
The rears are also recessed.The mounting bolts are short on both the front and rear. Your only option is to drill the crown and seatstay bridge,assuming there is enough meat there. I run single pivot calipers of different vintages.They work are are lighter than dual pivots....The mounting bolt on a DA rear dual pivot is 12mm long, and that is the max you get without the washer,and front is 27mm,no washer.
Thanks Rusty and follow up...MrDan
Jul 1, 2003 6:16 AM
I measured the fork crown and rear bridge, just no way,
13mm rear, 32mm front... Not enough meat no way no how!

Thanks for the info. Is the bolt something special (special shoulders, etc.), or could I find a replacement bolt (I'll check Rivendell) for just such occasions?

Thanks Rusty and follow up...Rusty Coggs
Jul 1, 2003 6:30 AM
Not your ordinary bolt.