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Gt ZR1.0 Lotto Owner's - Please advise...(6 posts)

Gt ZR1.0 Lotto Owner's - Please advise...jose_Tex_mex
Jun 12, 2002 5:20 PM
Thanks for any help. I bought a Gt ZR1.0 Lotto frameset and do not have the benefit of the bottom bracket spindle length. I would appreciate any feedback on the spindle lengths you have used. I would especially be interested in the lengths used by anyone with an 8 speed dura ace crank.

BTW - I tried their site and it sucks - nothing about road bikes and a buch of flash...
re: Gt ZR1.0 Lotto Owner's - Please advise...elviento
Jun 12, 2002 6:30 PM
The 8 speed Dura Ace cranks use 103mm BB, which is very unusual.
Thanks - Why is that unusualjose_Tex_mex
Jun 12, 2002 7:01 PM
Thanks for the response. I am happy to hear it takes a 103 since I found and ordered a Dura Ace BB which was onsale.
Why is the 103 size unusual? Is it normally bigger?
You'd have to check with Shimano.elviento
Jun 13, 2002 6:48 AM
Well, I am actually not aware of another BB model that has the same length. Even Shimano 600 and 105 BBs of the same era had different lengths (unlikely today, they are all the same size). The closest is Campy's 102mm but I understand Campy's spindle has a slightly different profile.

Why they never made another model of the same length? You'd have to ask designers at Shimano.
As I recall...Nessism
Jun 13, 2002 5:05 AM
...their are two different DA 8 speed cranks, the first generation and a second generation low profile version. The second version is more rounded and uses the 103 mm spindle. The older model has more square shaped arms and uses a longer spindle (not sure about the length).

I'm running the low profile cranks on both of my bikes and like them. Nice and stiff and the bottom brackets are indestructable. Good stuff.

you are right. The earlier 7403 cranks use a longer BB.elviento
Jun 13, 2002 6:46 AM
The newer model, 7410, had been around from maybe 1991? to 1997, and uses the 103mm BB.