San Jose Changes
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San Jose Changes
Howdy. I'm spinning out down here in Flat NOLA on the 42:17 (freewheel) stock drivetrain. I've bought a 46 chainring, but am concerned about chainline. Has anybody else upped the chainring on their san jose and had problems with this? I would like to put the new ring on the outside but I'm pretty sure I'd need a slightly shorter spindle.
#3
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If you put the new chainring in the same place, it will not change the chainline. If there is not enough chainstay clearance and you have to put the chainring on the outside of the spider, then you will be moving the chain out ~5mm, and you would want to get a shorter BB spindle.
#4
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Sure you can try to bring in the cranks closer by using a shorter spindle. Problem with that is sometimes the crank arms will not clear the chain stays......but that all depends on the crankset and the frame itself (especially frames that take wide tires).
Last edited by roadfix; 04-29-08 at 10:22 AM.
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yeah, I removed the bashguard and want to put the new ring on the outside. I haven't pulled my cranks yet to see if my BB is symmetrical (I've heard that the stock sugino bb isn't) and was hoping to save myself some time, see if anybody else had performed the same operation on a San Jose.
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There won't be. You're right, that's what I will do. The functionality of the thing comes first, obviously. I just want to know what I would have to deal with to put the new ring on the outside of the spider. If it is a simple matter of a $30 bb with a shorter spindle, then I'll start shopping around. Otherwise, I'm not going to cry about the ring being on the inside.
#8
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It's a simple matter of a $30 bb with a shorter spindle. Assuming of course you can GET one with a shorter spindle. If your current bb happens to be a 103mm spindle you're pretty much screwed, because that's as short as they come.
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Good luck jufimbo... I hope the alignment isn't too far off... your legs must be on the verge of catching on fire trying to spin that gearing in the Crescent city (while not going anywhere very quickly).
One probably ignorant question... could you not go with a smaller cogged freewheel?
Harris seems to have a 15 tooth that might work. Admittedly you may still be spinning out a bit, but at least it would be an improvement.
One probably ignorant question... could you not go with a smaller cogged freewheel?
Harris seems to have a 15 tooth that might work. Admittedly you may still be spinning out a bit, but at least it would be an improvement.
Last edited by tinydr; 04-29-08 at 12:05 PM.
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Right. Well I've already purchased the 46 toother, so I'll deal with it one way or the other. If it has to stay on the backside of the spider, so be it. But it sounds like that would have been a viable option. I've been itching to replace the stock chainring anyway as part of a general de-blacking effort. There is a lot of black componentry on a stock San Jose, IMO.
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Ok, so I put the 46 teeth on my cranks and got a sparkling new sram chain. And now my chainline is certainly off. I couldn't put the new chainring on the inside where the old one was, as it scraped the stay. So...my today's question is this: Does anybody know the stock bottom bracket size on the san jose? I don't have a crank puller and it isn't listed on the Bianchi site. Any chance at all its 107?
Last edited by Jufimbo; 05-05-08 at 08:48 AM.
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Ok, for anyone else searching for it, the stock bottom bracket on a 2008 Bianchi San Jose is...68 x 110.5. Pain in the *****. Mine was a tange. not sure if yours will be. I ordered a Sugino 103 from the Ebay and I hope that will help my effed chainline. I know that Shimano and Tange are basically the same thing, but can anybody tell me anything about the Sugino cartridge bb? Was it worth the extry $5 to get the name?
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Yeah, you shoulda got a (much cheaper) Dura-ace 15 tooth cog, left the ring alone and increased your gear inches on the cheap. Oh well. In my experience all name-brand sealed BBs are good.
{edit}... oh, wait, freewheel. Eh, you could only go down to a 16t, and then you'd be SOL when that was too small. I guess overall you're better off - bashguards are lame.
{edit}... oh, wait, freewheel. Eh, you could only go down to a 16t, and then you'd be SOL when that was too small. I guess overall you're better off - bashguards are lame.
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get a new rear wheel or buy a pista if you want something faster
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Howdy. I'm spinning out down here in Flat NOLA on the 42:17 (freewheel) stock drivetrain. I've bought a 46 chainring, but am concerned about chainline. Has anybody else upped the chainring on their san jose and had problems with this? I would like to put the new ring on the outside but I'm pretty sure I'd need a slightly shorter spindle.
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Right. I thought about getting a 15t from Harris for the back (after it was suggested here) but I'm crossing my fingers that this 103 will bring the chain in to 'well-enough.' Say, with all this talk about cogs, I have been wondering about the mechanics of increasing gear inches with a chainring vs. cog. Are there any performance differences? More pressure on different parts of the leg? Thx for all the advice BTW.
#24
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same thing in 2020... the bottom bracket and cranks that wont hit the stays but remain in the 42mm chainline is a major pain in the ass!