I wonder if RTP on 26" wheels would work? Could be an interesting choice as a travel bike.
IanA
Paul
Beijing
I have no doubt whatsoever that it steers just like the
"bikes Jan writes about". We'll know how Jan found it riding on
the road shortly, perhaps a couple of weeks, but the reviews
posted by owners to date would seem to indicate the frame is
stoutly overbuilt and the fork is very, very stiff on account of
the disc brakes and so it rides harshly. Nothing's for nothing,
and it would seem that the price for disc brakes is a harsh-riding
fork.
-- Steve Palincsar Alexandria, Virginia USA
Fork compliance is a whole lot less important when you are riding 47mm tires than it is with 30mm or smaller tires. When BQ did the fork compliance tests more than a decade ago most people on the BQ team were primarily riding 700C wheels with tires in the 28-32mm range (like what was tested in the original tire tests).
Disk brakes require some tradeoffs. They are heavier than rim brakes and will always make for heavier/stouter forks.
Also, it would surprise me if the Masi wasn't stout, but there are few production steel frames being made at this price point that aren't stout. A $1400 complete bike isn't going to use heat treated tubing, so the only option not to make it pretty stout would be using standard diameter tubing. That is also especially uncommon today, for reasons that I can't explain. On paper (I haven't ridden one yet) the Masi SR looks a lot nicer than a Surly Cross-Check or LHT at a similar price.
alex
The loads and forces are against making a "compliant" disk fork. To be compliant it needs to flex vertically under light loads, with that load spread across the whole fork blade. This is normally done by making the ends of the blades small in diameter and with a small radius rake bend to make the blades as long as possible.
A disk fork needs to be stiff between the dropout and the brake mount, that is a very short lever arm that very high brake loads are being passed through. It needs to be as stiff as a regular fork blade above that transfer loads to the steerer and headtube.
Since the disk fork needs to be much stiffer down low you can't get the compliance the normal way. A good way to get it would be with a suspension mechanism, but that is heavy. The other good place to get compliance is with wide tires. Jan rides the Firefly with 50mm tires, so the fork doesn't need to have the same flexibility characteristics as the Singer that he rode with 30mm tires to provide similar comfort.
You can easily see in photos of Jan's Firefly that the fork blades are straight (not curved) and 15mm or more at the bottom, compared to 11mm for his Singer. There is no way that the fork is flexible in the same way as his Singer or Rene Herse. Hahn's Bontrager has much thinner (also straight) blades, but is probably lighter than production bike companies would be comfortable with.
alex
Have you tried anything narrower on the disk fork and if so was the ride much worse - i.e., noticeably hard?
Later,
Stephen
Have you tried other tires? Just swap the front tire or wheel off of another 650B bike (assuming that you have one).
Retail WTB Horizons have fairly stiff sidewalls, is there any chance that Masi is using a OEM version that is even a little tougher?
alex
For those of us on the tail end of the BQ Distribution Curve,
could you summarize his findings? How closely did he track
Randall's observations?
The BQ review is not a complete review, it is more like a preview. It is based on 100 miles of testing by Jan and Mark. He does talk about component swaps that he'd do, including swapping bars.
The review is overall positive and excited about a $1420 bike with good handling and decent parts. It isn't as fast as Mark's 6 Hands custom bike, but it is also about 5x cheaper.
As always this is a good issue and if you are interested in more details I would go borrow it from your library or buy it. I'm only halfway through myself. I liked reading Natsuko's article talking about riding on mountain vs all-road bicycles and the article on Seattle builders Davidson and Kullaway.
I'm still excited by the Masi, it is everything that the original Kogswell P/R should have been, with what appears to be similar tubing too. Instead of a $750 frameset ($600 in 2006 dollars) we get a $1400 complete bike. That makes it a lot easier for anyone to go ride a low trail all road bicycle and see what it is like.
alex
The BQ review is not a complete review, it is more like a preview. It is based on 100 miles of testing by Jan and Mark. He does talk about component swaps that he'd do, including swapping bars.
The review is overall positive and excited about a $1420 bike with good handling and decent parts. It isn't as fast as Mark's 6 Hands custom bike, but it is also about 5x cheaper.
I'm still excited by the Masi, it is everything that the original Kogswell P/R should have been, with what appears to be similar tubing too. Instead of a $750 frameset ($600 in 2006 dollars) we get a $1400 complete bike. That makes it a lot easier for anyone to go ride a low trail all road bicycle and see what it is like.
He describes it as an “attractive, no-nonsense bike.” Compared to the responsive custom bike with similar geometry, he found it “solid and heavy," but later described getting used to the stiffer frame and found it “becoming more fun the longer I rode.” The fork was indeed stiff, but a bike in this price range is not going to have a flexible fork, even with rim brakes. He liked the handling and the included fenders, and there were good fender lines. He also praised the mid-fork braze-ons, Tiagra components, and low-trail geometry. With pump, pedals, bottle cages, and fenders, it weighed 30.9 lbs.
I think the point was that this bike is not comparable to a high-end bicycle, but makes a low-trail bike with wide tires and (stock) fenders available at a very reasonable price point. If you are looking for a flexible fork, light weight, and planing, it might not satisfy you, but probably no new bike at this price will.
I hope that provides enough information without violating any copyright.
Jon Blum
Hmm... Seller has a feedback rating of (1). Photos are stock from the Masi web site, showing a different size than the listing. That is, except for one, showing the bike dubiously boxed with the rear fender still attached and chafing its own access hole. Caveat emptor...
With a minimum cost of $1130 shipped, it isn't much of a savings off of a new, warranted and returnable bike.
A friend pointed out that Masi appears to be listening to the feedback and made a new "Elite" version of this bike:
https://masibikes.com/collections/adventure/products/speciale-randonneur-elite-2019
It would be nice if it had standard fork mounts for a porteur or handlebar bag rack, but that is a pretty small nit at this price point.
alex
I saw someone else digging up tubing specs for what "Cromor" means. I wouldn't get too excited about them, the frame factories in Taiwan seem to be able to get just about any tubing drawn to the dimensions that they want. The labels don't mean much.
I was surprised to see that Reed's measurements of the 2018 Masi showed what appears to be an 7/5/7 top tube and 8/6/8 downtube. I was expecting it to be 9/6/9 all around, because that is what is the best tradeoff in dent resistance and performance for standard
4130 tubing, which is what I assume they use. The lighter toptube (the 0.5mm part is what matters) should help the ride.
alex
A friend pointed out that Masi appears to be listening to the feedback and made a new "Elite" version of this bike:
https://masibikes.com/collections/adventure/products/speciale-randonneur-elite-2019
Dynohub, through axle front, compact (48/32) gearing, and aluminum fenders are now standard, and a number of the components got nice upgrades too. It is a smart looking production bike.
Available in regular and oversize, both .9/.6/.9, but the Masi is
OS, right?
-
That’s what the spreadsheet says. Of course the spreadsheet also says 7/5/7 top tube, so vOv.
You received this message because you are subscribed to the Google Groups "650b" group.
To unsubscribe from this group and stop receiving emails from it, send an email to 650b+uns...@googlegroups.com.
I was surprised to see that Reed's measurements of the 2018 Masi showed what appears to be an 7/5/7 top tube and 8/6/8 downtube. I was expecting it to be 9/6/9 all around, because that is what is the best tradeoff in dent resistance and performance for standard 4130 tubing, which is what I assume they use. The lighter toptube (the 0.5mm part is what matters) should help the ride.
--
As Matt mentioned I mostly trust your numbers. The other ultralight NFE (not the one you measured) is in my basement and the top tube is easy to ID because it is teardrop shaped and I know from Glen that it is True Temper tubing.
The teardrop True Temper S3 tubes are .51/.41/.51 according to this tubing sheet list from Henry James: http://www.henryjames.com/pdf/HJBpricelist2014.pdf
That is almost identical to your measurements, which makes me trust them.
On 4130 tubes the ends are almost always 0.3mm thicker than the middles, so I've just been looking at your middle number and ignoring whatever you have for the butt thickness. It's very likely that you could be measuring in the tapered section since we don't
know how the builder trimmed the ends.
Anything thinner than 8/5/8 would surprise me unless the tubing is high quality heat treated stuff like 853, OX Platinum, or S3. 8/5/8 doesn't surprise me, it's more prone to denting than 9/6/9, but still has a long history of being used. For instance many of those nice old Trek frames from the early 80s that are still in use have 531 8/5/8 top tubes.
I expect that measurement mistakes would show a thicker tube than reality, not a thinner one. I see lots of examples that seem thicker than what I'd expect, like the 531 Trek 710 and the
two OX Platinum bikes.
The whole point of 853 and other heat treated materials is to increase dent resistance while allowing for thinner walls.
I've long lost the spreadsheet, but a long time ago I computed the dent resistance for a small impact on 9/6/9, 8/5/8 and 7/4/7 tubing across Verus (4130), Verus HT, OX Platinum and S3. There is a reason that True Temper
makes Verus in 9/6/9, HT in 8/5/8, OX Plat in 7/4/7, and S3 in thinner walls. They end up with almost identical dent resistance.
There isn't a lot of reason to make something like OX Platinum in 10/7/10 unless you want to shoot bullets at it. It probably ends up with the dent resistance closer to 1.1 or 1.2mm thick 4130, which is heavier than even cheap MTBs from the 90s.
853 has very similar properties to OX Platinum.
alex
Reed! How do you have an ultrasonic tube tester but not even a cheapo pair of calipers!!!
--
-J
Clearly what is needed is a continuous measurement device that slides down the tube and gives readoita as you go. That way you can get a shape and definitive answer......
Now you need a small dyno-powered Raspberry Pi box to process these numbers and upload them to the spreadsheet or database automatically.
-J
There isn't a lot of reason to make something like OX Platinum in 10/7/10 unless you want to shoot bullets at it. It probably ends up with the dent resistance closer to 1.1 or 1.2mm thick 4130, which is heavier than even cheap MTBs from the 90s.