Thought experiment: 700c to 650A
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Thought experiment: 700c to 650A
Have any of you ever converted a 700c bike to 650A?
Consider it sort of a thought experiment... going from 700c to 650b (584mm) is fairly common, but I haven't run across much information or anyone's tale of converting to 590mm.
I'm kind of wondering how brake reach would be affected for direct-mount center-pulls...
Consider it sort of a thought experiment... going from 700c to 650b (584mm) is fairly common, but I haven't run across much information or anyone's tale of converting to 590mm.
I'm kind of wondering how brake reach would be affected for direct-mount center-pulls...
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700C = 622mm diameter 650A = 590mm radial difference = 16mm -- can your brake calipers handle that much additional pad drop?
Alternatively, do you want to try some form of drop bolt mounting?
Alternatively, do you want to try some form of drop bolt mounting?
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"Far and away the best prize that life offers is the chance to work hard at work worth doing." --Theodore Roosevelt
Capo: 1959 Modell Campagnolo, S/N 40324; 1960 Sieger (2), S/N 42624, 42597
Carlton: 1962 Franco Suisse, S/N K7911
Peugeot: 1970 UO-8, S/N 0010468
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I have done that, but I consider it an exceptional case. This was on a bike that could take a variety of wheel sizes; I started with 27", went to 700c, and then went to 650A. This is an English bike with 32 spokes on the grind wheel and 40 on the rear.🆒
The main reason you wouldn't do this is: the rim options in 650a are limited (anything you like as long as it's CR18) and the tire options are almost as bad (panaracer Col de la Vie is your best bet). Those are fine options if they suit you. I understand better options are available in Japan... do you live in Japan?
another advantage to 650a is that the aforementioned CR18 rims are available in both 32h and 40h drilling, perfect for an older English bike. Like mine. Few rims are available in both those options.
650b rims and tires can be expensive, but there are very high quality options. 650b tires can be found in a wide variety of widths. For high millage bikes, this may make a lot of sense.
In theory, 650a is fine. In practice, I find 650b more attractive.
The main reason you wouldn't do this is: the rim options in 650a are limited (anything you like as long as it's CR18) and the tire options are almost as bad (panaracer Col de la Vie is your best bet). Those are fine options if they suit you. I understand better options are available in Japan... do you live in Japan?
another advantage to 650a is that the aforementioned CR18 rims are available in both 32h and 40h drilling, perfect for an older English bike. Like mine. Few rims are available in both those options.
650b rims and tires can be expensive, but there are very high quality options. 650b tires can be found in a wide variety of widths. For high millage bikes, this may make a lot of sense.
In theory, 650a is fine. In practice, I find 650b more attractive.
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Don't mistake me: when I said "thought experiment," I meant it; I intended this is purely hypothetical discussion. No parts, no frame, no anything bought. I'm just curious about the possibilities.
I can only wish: it would make practicing Japanese a lot easier.
Residency in Japan is quite difficult, as your employer has to constantly vouch for your visa status; if you get fired or quit, you have 3 months to leave the country. Like Switzerland, permanent residency & immigration is almost impossible (without marrying a Japanese national) & can take decades.
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Residency in Japan is quite difficult, as your employer has to constantly vouch for your visa status; if you get fired or quit, you have 3 months to leave the country. Like Switzerland, permanent residency & immigration is almost impossible (without marrying a Japanese national) & can take decades.
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Last edited by DIMcyclist; 06-14-18 at 06:52 PM.
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I think @ThermionicScott did that, but was dissatisfied and converted to 650b afterward. Has a detailed thread about his Bianchi.
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So here you have two actual experiments, not thought experiments. I would think the question has been asked and answered.
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I've done it, and made a thread about it. Theoretically there's nothing wrong with it, it's easy, but the selection is one rim and a couple tires. Ultimately the Panaracer col de la vie is a lackluster tire if you're after any performance, and mine never measured much more than 35mm, meaning you'd be better off with 27" to 700x32-35 conversion, or a 650b conversion with quality tires.
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The main reason you wouldn't do this is: the rim options in 650a are limited (anything you like as long as it's CR18) and the tire options are almost as bad (panaracer Col de la Vie is your best bet). Those are fine options if they suit you. I understand better options are available in Japan... do you live in Japan?
Of course, shipping cost for a rim might be a problem...
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I’ve bought rims and tires directly from Gran Bois, and shipping wasn’t terribly costly, but that depends on yen-usd relationship at the time, of course.
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i've done it and as was said before there are two problems. cr18 rims while good in every other size are too large in 650a and there arent many decent tires. the ones that are decent flat very easily. by the way i used tektro long reach brakes and they worked really well.
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That's kinda what got me wondering: the canti braze-ons can't be raised or lowered, so how would someone use a smaller wheel size, if the initial brake-reach remains fixed? Shorter canti arms? Drop bolts? Or maybe a wheel size that isn't so much of a jump as from 700c to 650b?
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Now that department store MTBs with 650B wheels are thing, there are cheap rims available in the 650B size. I've found a mismatched pair at the local co-op, 36/32h... they were disc wheels but the rim sidewalls have a brake wear indicator so I am gonna use them as a cheap way to try the kool-aid. The co-op supplier's catalogue lists a generic 650B rim for sale and it looks a bit like a rhyno-lite so if nothing else it should take a beating. That 650B rim is the same price as their generic 650A so price-wise it's kind of a wash at the low-end now, at least for me.
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Pics or it didn't happen...
;-)
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If someone tells you that you have enough bicycles and you don't need any more, stop talking to them. You don't need that kind of negativity in your life.
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Just think of this as a non-bikeporn thread safe for kiddies.
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Yah, I think my chain-lubing technique has changed at least three or four times since we've had one, in fact. That's three or four missed chances to tell you guys you're doing it all wrong and only I know the One True Path
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I think @ThermionicScott did that, but was dissatisfied and converted to 650b afterward. Has a detailed thread about his Bianchi.
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You only get 16mm more clearance if the tire size doesn't change. Most 650A tires are 35-38mm, which gets you a wheel that is the same diameter as a 700x23C.
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Residency in Japan is quite difficult, as your employer has to constantly vouch for your visa status; if you get fired or quit, you have 3 months to leave the country. Like Switzerland, permanent residency & immigration is almost impossible (without marrying a Japanese national) & can take decades.
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