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Retro Shifting Question(8 posts)

Retro Shifting QuestionDave Hickey
Jun 20, 2001 7:59 AM
I have an old 7 speed 105 equiped bike. I want to put STI shifters on this bike. Will 8 speed work or do I need 7 speed. Is the cassette spacing the same for 7 and 8?
re: Retro Shifting Questionmuncher
Jun 20, 2001 10:04 AM
I did this with my old R600 105 7 speed - worked fine, and the 8 shifters were dirt cheap too - well worth it. In any event, you may well be able to get an 8 block on there (as I did eventually) and get a double benefit for not a lot more money.

Enjoy.
re: Retro Shifting QuestionDave Hickey
Jun 20, 2001 12:35 PM
Thanks, this is my third bike so it won't see alot of use, but I really like STI. Downtube just doesn't do it for me anymore
cog spacing is different...C-40
Jun 20, 2001 8:19 PM
FWIW, 7 speed cog spacing is 5.0mm and 8 speed in 4.8mm, center to center. It's easy to change out the spacers to the thinner 8 speed, to match 8 speed shifters.

I tried using an 8 speed cassette (7 of the cogs) on my '91 model 7 speed hybrid, and it didn't shift well until I installed the 7 speed spacers to match the 7 speed shifters (makes sense).

I've always thought that shimano changed the amount of cable pull on their shifters to create the correct rear derailleur movement for 7,8 or 9 speed spacing. There are those who claim that this is not correct. I don't use shimano, so won't waste my time to verify this claim.
re: trouble with road paint?MeDotOrg
Jun 20, 2001 9:04 AM
Thick road paint is smooth, not very porous, and can be very slick. Often I will ride on a solid line when going up a hill, on the theory that it lowers my rolling resistance. But I would definitely stay off in the wet...
Slippery when wet...JL
Jun 20, 2001 9:21 AM
Luckily, I haven't gone down (almost though), but I've hit a few wet paint stripes the wrong way and almost lost it. Also luckily without a car coming from behind.

You really need to watch around them when they're wet. As well as the other slippery items: manhole covers, etc.

JL
Complain to the City!Jerry Gardner
Jun 20, 2001 11:25 AM
I'd register a complaint with the local city traffic department. Traffic engineers rarely pay any attention to the impact of their actions on cyclists.

If I had my way, I'd force all traffic engineers to ride every road in their city--at night, in the rain--just to give them an idea of how their actions affect us.
One of the great pleasures...MikeC
Jun 20, 2001 1:27 PM
...in road riding is finding a couple of miles of new road paint (I'm talking about the right hand line next to the shoulder, my fellow Americans!). It's so smooth it feels like riding on air!
But I'll make sure I stay off it after a rain.