On Dec 3, 2:56 pm, Steve Palincsar <[EMAIL PROTECTED]> wrote: > According to the table on Sheldon's sitehttp://sheldonbrown.com/k7.html > both sprocket thickness and spacer thickness changed between Shimano > Hyperglide 7 and Shimano 8. The 7spd is 1.85mm sprocket thickness, > 3.15mm spacer thickness, and the 8 is 1.8mm sprocket thickness and 3.0mm > spacer thickness. Center to center spacing went from 5.0mm for 7 spd > Hyperglide to 4.8mm for 8spd.
The cag spacing does not matter that much. What matters is the hub type. The 6/7 speed hub requires less dish that an 8 speed hub because Shimano increased the hub size to accomodate more speeds when they went from 7 to 8 speeds. 7 and 8 speeds are very close. You can even use the same shifters in most cases. Here is a neat trick if you want more speeds with minimum dish: use a 7 speed freehub with 9 speed cogs, but leave one of the cogs out of the mix. This give you the best of both worlds: more speeds, good economy, stronger wheels.... Chris tallsteelbikes.googlepages.com On Dec 3, 2:56 pm, Steve Palincsar <[EMAIL PROTECTED]> wrote: > On Wed, 2008-12-03 at 11:25 -0800, tallsteelbikes wrote: > > The cog spacing got tighter when they went from 6 to 7 not from 7 to 8 > > speed. > > According to the table on Sheldon's sitehttp://sheldonbrown.com/k7.html > both sprocket thickness and spacer thickness changed between Shimano > Hyperglide 7 and Shimano 8. The 7spd is 1.85mm sprocket thickness, > 3.15mm spacer thickness, and the 8 is 1.8mm sprocket thickness and 3.0mm > spacer thickness. Center to center spacing went from 5.0mm for 7 spd > Hyperglide to 4.8mm for 8spd. > > > So if you want a stronger wheel with less dish go with 7 speeds or > > less on a 7 speed freehub cassette system or a 5/6/7 speed freewheel > > system. > > Or, as others have suggested, you can use an asymmetric rim. > > > Who really needs or wants 8/9/10 speeds > > For some applications the closer spacing of gears (not sprockets) gives > you some advantages. To me those advantages primarily apply to lightly > loaded bikes. When I pack on some cargo, I find I lose momentum quickly > enough that the 1-tooth gear changes that seem so nice and handy on an > unloaded bike become insignificant piddling hardly worth shifting for. > > > and weaker wheels with more cost and maintenance anyway? > > Not a given, as far as I'm concerned. Maintenance is no different; > chain and sprocket life seem to be the same. > > > Only reason is if you are stuck on STI > > or just need the latest gadgets to keep up with the Jones'. > > And we haven't even mentioned the 2009 Campagnolo Super Record group -- > the one they should have called the Spinal Tap Gruppo (because it goes > to 11). I think bikesnobnyc's take on that fully represents my > position. --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "RBW Owners Bunch" group. To post to this group, send email to [email protected] To unsubscribe from this group, send email to [EMAIL PROTECTED] For more options, visit this group at http://groups.google.com/group/rbw-owners-bunch?hl=en -~----------~----~----~----~------~----~------~--~---
