Some tweaks to the V

Greg S

Guru
As I’ve said a number of times elsewhere, for me and the kind of riding I do, a 30 degree seat angle is perfect. I love riding the V20c but a longer ride this past weekend with some “tricky” situations (sharp turns, traffic, etc) reinforced my opinion that I’d love it even more if the seat angle were closer to 30.

So I resolved to do something about it. I bought a couple of foam wedges, cut one to the width of the V20c frame and applied Velcro top and bottom. If you zoom way in on the photo you’ll see that a single piece wasn’t quite long enough (I was worried about the seat not having enough support) so there’s a second wedge behind the first piece.

The result? 29.2 degrees - perfect! I’ve ridden it a couple of times after adjusting the fit because I’m a little farther forward and it’s a total win. A bonus is that there’s a slight amount of flex in the back half of the seat (I have the Cruzbike custom carbon seat and headrest) which ”gives” a little when you hit a bump so they’re less jarring. It’s possible (though unlikely in my opinion) that repeated flexion will crack the seat but I figure if a 777 wing can flex up and down tens of thousands of times without failure this should be fine given the small amount of force being applied.

The second tweak is I wanted a smaller and lighter rear bag than the Cruzbike race bag (which I own). I‘ve got dozens of bags from my DF bikes but I couldn’t figure out a decent way of mounting them. It finally occurred to me that aero bar extensions would fit in the slots in the frame and one of the bags I have (an Ortleib) with a mount that’s supposed to bolt onto seat rails could be used to bolt onto the extensions.

It was a bit of a tight fit getting the aero bars into the frame but a little grease (both elbow and the other kind) got it done. I’m very happy with the result. Big enough for the stuff I usually carry and there’s room between the bag and the seat to strap other stuff if needed.

Here are a couple of photos:

View attachment IMG_3974.jpeg


View attachment IMG_3975.jpeg
 

CruzRider

Well-Known Member
Nice job. Looks great!

Why did you decide against the Cruzbike wedge? That would have been placed between the pad and the seat.
 

Greg S

Guru
Nice job. Looks great!

Why did you decide against the Cruzbike wedge? That would have been placed between the pad and the seat.
I found the Cruzbike wedge to be too hard and could never find a position that felt comfortable despite lots of trying. That might be because it’s made for the S40 and not the V but I don’t know.

And as I mentioned, a real bonus of having it under the seat is the small amount of flex in the top of the seat and headrest. It does a noticeably good job of damping impacts.

One afterthought: the Cruzbike wedge also is very short and thus a very steep angle which (for me) contributed to not being able to find a comfortable position. A longer and more gradual slope (which the wedges I bought have) would work better. I *might* have been able to put them between the seat and pad but I’m very happy with the result I achieved so I doubt I’ll experiment with it.
 
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Greg S

Guru
One addendum to my previous post. The particular wedges I bought have just the right density. Since they’re made to stand on to stretch calf muscles they’re “not too soft, not too firm” - just right for this application.

I cut the piece that I applied to the frame with a very sharp filleting knife - worked perfectly!
 

Cadguy

New Member
how are you measuring to a tenth of a degree? I can’t fins a spot that is straight enough to use…
 

Greg S

Guru
how are you measuring to a tenth of a degree? I can’t fins a spot that is straight enough to use…
I lay a flat board on the seat from the start of the rise to approximately where my shoulder blades are, iPhone measure tool to measure the angle.

TBH, absolute precision isn't that critical - at least not to me - so if it's 28 or 31 degrees I'm OK with it. Having said that, I do believe the measurement is reasonable accurate. Similar technique on the S40 yields (wait for it!) 40 degrees.
 

Joe Riel

Active Member
Is that the adjustable seat (which I have)? How did you attach it to the frame? I bolted the upper part, before it bends up, to the frame, but on yours that part would be on the foam. Also, what is that orange material between the seat and Ventist seat cushion?
 

Greg S

Guru
Is that the adjustable seat (which I have)? How did you attach it to the frame? I bolted the upper part, before it bends up, to the frame, but on yours that part would be on the foam. Also, what is that orange material between the seat and Ventist seat cushion?
The adjustable seat comes in two pieces: the lower part which bolts to the frame in two places and the upper part which bolts to the lower part.

The orange material is a layer of foam between the seat and the ventisit pad that provides some additional cushion.
 

Joe Riel

Active Member
Thanks. Just to clarify, you removed the small bracket that holds the upper part of the fixed lower piece to the frame. That bracket is normally clamped to the frame; the bolts are covered by the upper sliding piece. In your case, I assume that bracket is missing. The sliding piece is connected to the fixed piece by four bolts and the velcro you applied.

Did the thin layer of foam make a difference?
 

Greg S

Guru
Thanks. Just to clarify, you removed the small bracket that holds the upper part of the fixed lower piece to the frame. That bracket is normally clamped to the frame; the bolts are covered by the upper sliding piece. In your case, I assume that bracket is missing. The sliding piece is connected to the fixed piece by four bolts and the velcro you applied.
Not quite correct. The bracket is not missing and is I used it to bolt the seat to the frame.
Did the thin layer of foam make a difference?
I feel like it did. Small, but noticeable. I also put the extension that I had from the stock seat on the end to lengthen the seat a bit.
 

Greg S

Guru
Thanks. Just to clarify, you removed the small bracket that holds the upper part of the fixed lower piece to the frame. That bracket is normally clamped to the frame; the bolts are covered by the upper sliding piece. In your case, I assume that bracket is missing. The sliding piece is connected to the fixed piece by four bolts and the velcro you applied.

Did the thin layer of foam make a difference?
It's rather a PITA to disassemble but if I have occasion to do so I'll take a photo.
 

Joe Riel

Active Member
Did you use long bolts that went all the way through the angled foam? The bracket is near the upper part of the lower piece. In your side view picture that would be about halfway between the two visible screws that clamp the sliding and fixed pieces together.
 
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