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Raleigh Portage build, first ride, 650b first impressions

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Raleigh Portage build, first ride, 650b first impressions

Old 09-29-11, 08:14 AM
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Originally Posted by olek
Agree with that completely.

But I fail to see how that explains difference in acceleration between bikes with 650b and 27" wheels.

If rotational mass of the wheels is about the same, and their outside diameter is also about the same, they should accelerate in a similar way.

Here is an interesting read on the subject: https://www.tomsarazac.com/tom/opinions/wheelsize.html

My personal opinion is that once there is wider/heavier tire installed on 650b wheel, it has about same acceleration properties as 27"/700 wheel, and behavior differs only because of wider tire (more plush, compliant ride with a tad higher rolling resistance, and tire would behave much better when taken to moderate off-road situations, like dirt path or gravel road.). But I have to admit that I have sold my 650b bike 2 years ago, and it was not really comparable to my road bikes, so I may be wrong on the subject.
I think you are correct. Personally, I see no difference in acceleration between my 650B bike and any of my 700C/27" bikes. However, my 20" Bike Friday tandem accelerates (and also stops) quite quickly, despite its hefty 50 lb. So even though it's not a direct comparison, I think I can feel the difference with the much smaller wheels. What completely confounds me, though, is that despite the fact that the smaller wheels contirbute much less gyroscopic effect than my road bikes' wheels, I can manage to stay upright on it even when approaching a dead stop. I can literally stay balanced while rolling less than a few inches per second; can't do that on my road bikes. But then, that may be because of a very low center of gravity and not because of a lack of gyroscopic effect.
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Old 09-29-11, 08:53 AM
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I agree that at a very low speeds gyroscopic effect plays absolutely no role, and bike stability is defined by other factors (such as center of gravity, trail, width of ground-to-tire contact path etc).
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Old 09-29-11, 09:04 AM
  #78  
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Very nice bicycle!
But I still don't understand what the difference would have been between using 650Bs or 26" x 1.5"/1.75" slicks on that same bicycle.
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Old 09-29-11, 09:08 AM
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Originally Posted by Reynolds
But I still don't understand what the difference would have been between using 650Bs or 26" x 1.5"/1.75" slicks on that same bicycle.
Probably not much. Even though there are nicer, road-specific tires made in the 650B size, I think. More importantly, that bike has canti braze ons for a 584 rim, not a 559 rim.
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Old 09-29-11, 09:44 AM
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/\

what he said
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Old 09-29-11, 10:10 AM
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Originally Posted by Displacement
I was thinking that that caramel colored Brooks tape would look killer with your gear bag and against the black, but I don't think it would work with the dark seat. Still, brown + black = the business
You mean like this?



holiday didn't want to deal with copyright infringement.
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Old 09-29-11, 10:36 AM
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^ Does that bike have its own thread? Show me. I have a lot of criticism to post.
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Old 09-29-11, 10:41 AM
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Originally Posted by ColonelJLloyd
^ Does that bike have its own thread? Show me. I have a lot of criticism to post.
No, I've cleverly embedded it in others' threads precisely for this reason. Sly like a cuckoo bird.
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Old 09-29-11, 10:51 AM
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Another stunner Holiday, must be geting crowded in your official bike shed. Chris
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Old 09-29-11, 10:54 AM
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Originally Posted by JunkYardBike
You mean like this?



holiday didn't want to deal with copyright infringement.
Kogswell?
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Old 09-29-11, 10:58 AM
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Originally Posted by Maddox
Kogswell?
Indeed.
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Old 09-29-11, 11:21 AM
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Originally Posted by JunkYardBike
Damn fine build and color combo, sir! Makes me want to build a black 650B bike around black Hetres.
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Old 09-29-11, 11:39 AM
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Originally Posted by JunkYardBike
Originally Posted by ColonelJLloyd
^ Does that bike have its own thread? Show me. I have a lot of criticism to post.
No, I've cleverly embedded it in others' threads precisely for this reason. Sly like a cuckoo bird.
In that case, we'll start a thread specifically for criticism of that bike given you were specifically trying to avoid it!
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Old 09-29-11, 12:06 PM
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Originally Posted by JunkYardBike
You mean like this?



holiday didn't want to deal with copyright infringement.
"Dos" says hi.


(Almost) finished bike by pruckelshaus, on Flickr
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Old 09-29-11, 04:04 PM
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Originally Posted by TireLever-07
Another stunner Holiday, must be geting crowded in your official bike shed. Chris
thank you sir! It's crowded but getting bette. Over the past few years I've tried a lot of stuff and sorted out what i really like, so I probably have
less stuff overall. Still, it's not very rationale and there certainly is some overlap
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Old 09-30-11, 02:21 PM
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Well with the help of the Colonel, I got a new hunters pass VO rack with the integrated decaleur. I still need to twaek the front fender a little bit, but you get the gist.







The front wheel will be getting the vo switchable dyno built into it this week.

While I was outside taking this pics just a few minutes ago my wife came out and said

"what is that bike? I've never seen that one"

I said "Ahh, you've seen it, i'm sure."

Then she proceeded to tell me she wants it. She doesnt get its way too big for her.

Anyhow....
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Old 09-30-11, 02:39 PM
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Oh, yeah! Very nice.
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Old 09-30-11, 02:57 PM
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650b gets the ladies every time.......and get some dust caps for those cranks! What were you, raised in a barn**********?

Last edited by fender1; 09-30-11 at 03:08 PM.
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Old 09-30-11, 03:06 PM
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Man oh man oh man oh man. This is the best.

And I love what your wife said. Make one for her. It will be a labor of love in more ways than one.
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Old 09-30-11, 04:21 PM
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Originally Posted by olek
If rotational mass of the wheels is about the same, and their outside diameter is also about the same, they should accelerate in a similar way.
One of the advantages of 650b is that it puts a great deal of the rotational mass closer to the hub. That makes the wheel spin up faster when you stomp the pedals. So even though the overall mass is the same... and the overall height is the same... the rim (and consequently a lot of the mass) on a 650b wheel is closer to the hub. That makes the wheel accelerate essentially like a smaller diameter wheel.

And don't confuse the effects of rolling resistance and rotational mass.
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Old 09-30-11, 05:21 PM
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Originally Posted by fender1
650b gets the ladies every time
Sure does. And the lady gets the 650B:

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Old 10-08-11, 09:56 AM
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Hi Holiday76, this is very nice! I've been looking for a Portage frame for some time now but now I think I should get more serious about my search. Could you please tell me what the frame size of yours is, and what the top-tube clearance is? I know I could fit a 23", not sure if the 25" would be just right or too tall....
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Old 10-08-11, 11:12 AM
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Originally Posted by ewmyers
Hi Holiday76, this is very nice! I've been looking for a Portage frame for some time now but now I think I should get more serious about my search. Could you please tell me what the frame size of yours is, and what the top-tube clearance is? I know I could fit a 23", not sure if the 25" would be just right or too tall....
sure. Mine is a 63cm ctt seat tube. I can't measure the top tube right now though as the front wheel is apart having it's new VO switchable dyno installed. When I get that back I will take some numbers down for you.

I will share this random none drive side pic from this morning, before I took the wheel to my LBS for the new hub:

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Old 10-08-11, 11:15 AM
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I think that bike is what Raliegh sold as a 25.5" frame.
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Old 10-08-11, 11:21 AM
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this one actually came in 21, 23 or 25>


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