tiger1964 

Yeah, mixte tubes would have been a possible option.

Well, maybe I found who I want to draft behind on my next ride!

clubman 

Check the diameter of the seat stays...beefy! They look as wide as the tires.

cb400bill

Current Bill

jptwins

I have to agree that the Bob Jackson must be bigger. My Panasonic is also a proper 27" (68cm) and the headtube isn't nearly as long:

Commuter setup

I can only guess it's because the top tube is shorter, bringing the headtube closer the the seattube. Still, I'd love to take this for a testride, since it's most definitely lighter than my gaspipe steed.

Rocket-Sauce 

Why do frames seem to "top out" at 58cm top tube? I've seen a few 60cm tt, but rarely bigger. It is like they are forcing big dudes into a more upright and less aero position. I believe this was a conspiracy by smaller guys to get an even bigger wall to draft behind?


I understand that if you built a huge, say 70 x 70 frame, it would be noodly, but wouldn't an extra tt help that? Or some more triangles like Yao's ride? Isn't that why big-boy Rivendells come with an extra tt?

DsmBerg

That Jackson looks bigger than 68... here is a 68 cm Fuji Sports 12 frame I picked up off Craigs a couple weeks ago. Threw some wheels on it to demonstrate hugeness. I think its roughly an '80. I'm 6'5" and the stand over height is insane.

ColonelJLloyd 

Mondia seems to be the exception among vintage marques. Most Mondias I've seen have a top tube just about the same length as the seat tube.

wahoonc

For once I see a bike that I is TOO BIG for me to ride

Aaron

SteveSGP

So I messaged the seller and they said from center of crank up the seat tube to the center of the top tube it's 68cm.

I know manufacturers advertised based on center or top of the crossbar but is there a standard that most here go by?

I was always under the impression that center of crank to top of crossbar was the accepted measurement.


.

NightShift

Just stumbled across this and thought I'd post the link for all you tall riders: https://philadelphia.craigslist.org/bik/2966160446.html

noglider 

There have been two methods of measuring for a long time, probably because they started in different countries. With standard diameter top tubes, it makes only a small difference.

Frames with tight clearances for wheels have longer head tubes, making them look bigger.

753proguy

Just to add to that, with non-oversized tubing, add 1.5 cm. to a c-c number to get c-t size.

Also, BB height (or BB drop, more precisely) and seat tube angle affect head tube length. A track frame with an 11" BB height 'lengthens' the head tube by about one-half inch vs. one that is otherwise the same but has a 10.5" BB height.....

650B frames have longer headtubes than the same size of 700c frames, etc., etc....

hxzero

Shawn Bradley and his 80cm Trek, which was comically stolen from his house by a guy about 5'11" (but thankfully later found and returned). Why didn't they give him longer chainstays? I can't imagine there being much confidence on climbs if you wheelie whenever you sit down.

BigPolishJimmy

Of course I have to post my huge Fuji for size comparison ;p

*edit* I know, I know... my pics are stale. I got to get a new build going now that the semester is over.

iluvnoise

There's also this one: https://philadelphia.craigslist.org/bik/2991474779.html
A 68cm Super Course.

Kobe 

That ones mine, just moving out some of my smaller bikes.

The largest top tube I have seen by any brand are the Bridgestone's. On my 400 the st is 68cm and the top tube is 62cm, making it the only bike I do not need a 130-140 Nitto extension. It is not whippy at all, but it is not double butted, Bridgestone double butted all 400'd only up to 64cm.

southpawboston

Could it be that really tall people still have fairly "standard" vertebrae? i.e., difference in height is more a function of leg length than back length? Just a theory. I was under the impression that vertebrae don't vary much in size, but I could be wrong.

cehowardGS

Yup, 64 would be his. Mine is a 63, and it is close to his.

non-fixie 

There's currently a 70 cm Gazelle Champion Mondial for sale over here. Pretty easy on the eyes for such a large frame:

https://fietsen-brommers.marktplaats....5-biopace.html

Wildwood 

My '85 Trek 600 and '72 Raleigh SuperCourse have a seat tube (CtT) of 64cm. Head tubes are 22 & 21cm respectively. TTs measure 58.5 (CtC). With 27" wheels the SuperCourse is as tall a bike as I dare ride. 6'1" and a tad. The old school of "straddle the TT with a fist of seatpost" still works in the new world of people riding smaller & smaller frames.

NightShift

If it was my size I'd be trying to find a way to get it to Vegas. It's a beautiful bike. Of course it's no where near my size (well, the toptube is probably about rightl).

NightShift

Most really tall people have proportionately long legs, but there are exceptions (think Andre).

hairnet

From my experience with this 67cm frame which has a 61cm TT
I needed a short stem on this bike because the massive head tube forced me into a somewhat upright position. My other bike , a 62cm, also has a 61cm TT but I ride with a 130 stem to get that comfy flat forward extension. On the 67cm with a 130 stem I felt like I was uncomfortably reaching for the bars

SteveSGP

So how did the Bob Jackson not sell?

There was bidding on it but it shows to be ended with no bids, it was a no reserve auction so I'm confused.

photogravity

At T-Town on Saturday, Sam Fitzsimmons brought along a slew of HUGE bikes and frames. I think someone mentioned the Witcomb as being a 28.5" (72.4cm), and I saw that frame there. There was another one Sam had there which was even larger, measuring 74cm (c-c).