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Folding Gravel Bike build

Old 05-14-19, 07:56 PM
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pinholecam
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Folding Gravel Bike build



I'm going to build up the above frame (a ChangeBike DF-833G 650B MTB frame) into a gravel bike and need some inputs on the setup selection.

Purpose wise, I'd want to use it for weekend rides with roadies and also as the touring bike where it will see use on trails/gravel.

Its going to be with the Shimano 105 groupset running a 50/34T chainring and XT 11-40T cassette expanded via a road link.
Shimano 105 R7000 Compact Chainset (11 Speed) 50-34T
Shimano XT M8000 11 Speed 11-40t Cassette

One big issue will be the brakes.
I'd like to use cable actuated ones for easier troubleshooting (esp in the field).
So the TRP Spyre (cable actuated, road pull ratio) seems to be an ideal choice.
I am very confused by the mounting.
The frame seems to be IS mount and the TRP are either in post mount or flat mount.


1. So I should be getting the post mount version and using Post > IS adapters?
2. Do the adapters need to be TRP branded or just the generic Shimano ones will do?
3. I don't see the brakes having front/rear options so does that mean the same brakes are for both front and rear?

Any other inputs are welcome, especially on whether running a road link to expand the gear range will be viable.


TIA
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Old 05-14-19, 08:28 PM
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I ran a 50/34 crankset with an 11-36 cassette and did not need a roadlink.

Now I'm running 46/30 with an 11/42 cassette and don't need a roadlink either.
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Old 05-15-19, 03:28 AM
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Why? Thatís a 5.5 pound frame thatís going to be extremely stiff. Itís going to handle strange with skinnier tires and really strange if theyíre slicks. As someone whoís done a few roadie rides on a drop bar mtb with slicks - youíll need to be seriously strong to keep up unless itís a very casual ride.

But thatís not really what you came here for I suppose. I did note that although the Change website is seriously lacking specs, Iím almost certain your chosen crankset isnít going to work on that frame.
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Old 05-15-19, 04:38 AM
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To answer your original questions.

1-yes
2-it doesn't have to be brand specific
3-the same caliper is used for front and rear

You didn't ask, but I agree that your chosen crankset will probably not work on that frame. The bottom bracket is 68mm, so that will work with the road cransket, but the crank arms probably wont clear the chainstays. The distance between the crankarms on most Shimano road doubles is 116mm. Measure the distance across the chainstays at 170-175mm back from the center of the bottom bracket. If it is more than 110mm, you don't have enough clearance to use that crankset.
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Old 05-16-19, 01:21 AM
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Originally Posted by Spoonrobot View Post
Why? Thatís a 5.5 pound frame thatís going to be extremely stiff. Itís going to handle strange with skinnier tires and really strange if theyíre slicks. As someone whoís done a few roadie rides on a drop bar mtb with slicks - youíll need to be seriously strong to keep up unless itís a very casual ride.

But thatís not really what you came here for I suppose. I did note that although the Change website is seriously lacking specs, Iím almost certain your chosen crankset isnít going to work on that frame.
The plan is for 35-38mm tires for the road riding, changing out to 45mm or wider when I need them (like for touring/trails).
I do ok with roadie rides on my 20" foldie, so long as I am sneaky and draft most of the time.
So this larger wheeled bike should at least perform at least the same (thats the plan anyway ).
This is not my only bike and I do have a Tri-bike, but it'd be nice if this new bike serves double duty every now and then.

Ok. Noted on the crankset.
If thats the case, is there something out there that would clear the chainstays and be at least 46/30T?


Originally Posted by dsaul View Post
To answer your original questions.

1-yes
2-it doesn't have to be brand specific
3-the same caliper is used for front and rear

You didn't ask, but I agree that your chosen crankset will probably not work on that frame. The bottom bracket is 68mm, so that will work with the road cransket, but the crank arms probably wont clear the chainstays. The distance between the crankarms on most Shimano road doubles is 116mm. Measure the distance across the chainstays at 170-175mm back from the center of the bottom bracket. If it is more than 110mm, you don't have enough clearance to use that crankset.
Thanks for the inputs.
I just ordered a pair of TRP Spyres.

If you know of a crankset that can clear the chainstay and takes 48/32T or 46/30T, do let me know. TIA
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Old 05-16-19, 07:10 AM
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The White Industries G30 crankset will work with that frame and get you the gearing you want. Otherwise, I think you may be stuck with an MTB crankset. SRAM makes a few 2x MTB cranksets with 42/28 chainrings.
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Old 05-19-19, 09:28 PM
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Thanks for the replies.

Any idea if the Shimano GRX chainring with 46.9mm chain line will be worth waiting for to see if its a better fit?
The White Industries G30 has a chainline of 45mm, so it seems to suggest that the GRX will be a bit wider.


(Sorry, totally no knowledge on MTB stuff).
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Old 05-19-19, 10:26 PM
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Alternate suggestion, if you aren't in a hurry(and not super tall): Velo Orange is making a mini-velo. https://velo-orange.blogspot.com/201...e-is-live.html

I want one so I can just slide it in the back seat of my car, or the hatch of a small suv without having to take the wheels off.

But I'm not sure if the sizing will work for me.
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Old 05-20-19, 04:46 AM
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Originally Posted by pinholecam View Post
Thanks for the replies.

Any idea if the Shimano GRX chainring with 46.9mm chain line will be worth waiting for to see if its a better fit?
The White Industries G30 has a chainline of 45mm, so it seems to suggest that the GRX will be a bit wider.


(Sorry, totally no knowledge on MTB stuff).
Chainline doesn't effect the width of the crankarms. Look for Q-factor as an indicator of more width between the arms. I think the GRX only has about a 5mm wider Q factor than the road cranks, so just 2.5mm more clearance per side.

GRX has a Q-factor of 151mm and the G30 has a Q-factor of 171mm.
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Old 05-20-19, 11:28 PM
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Originally Posted by Sullalto View Post
Alternate suggestion, if you aren't in a hurry(and not super tall): Velo Orange is making a mini-velo. https://velo-orange.blogspot.com/201...e-is-live.html

I want one so I can just slide it in the back seat of my car, or the hatch of a small suv without having to take the wheels off.

But I'm not sure if the sizing will work for me.
I just saw that yesterday too.
I've already got 2 mini velos.
In fact I toured on a smaller 18" one for a few years.
The reason for looking at a 650b build is that I found during touring that it would almost always involve some trail riding to some degree and small wheels are harder to roll over rocks, roots, etc.
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Old 06-05-19, 02:56 AM
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Just a short update on the status.

The frame arrived and I brought it to the LBS for a try out with a used 105 50/34T crank. The chainring was near touching the chainstay, while there were no issues with the crank arms clearing.

So I have to go for a smaller chainring, but I did not want to go under 42T if I could, to get the high gears for road rides.
I came up with a SRAM Apex brifter and X9 rear/crank combination, but unfortunately, the SRAM distro here does not carry such "less common" items.
So back to the drawing board....

Next, I thought of just paying up and getting the Force 1x with the 42T crankset and 10-42T cassette.
Again, another disappointment from the local distro.
They just don't have such 'weird' combos since 'real users' only use Red...
I'd have to order now and get them in August.

The SRAM clampdown on online retailers frustrates me since the local distro is basically sitting on their laurels and unwilling to provide a good range of Sram products while finding them online and willing to ship to Singapore is so hard.

Ended up, not willing to let the distro earn my money for such poor support and found an online store I could buy from.
Got the Rival 1x instead which was my preferred budgetary choice anyway and saved me a fair bit over Force 1x.

I just hope everything fits when they arrive.
My preliminary measurements do indicate that the 42T chainring should just clear the chainstay into the recessed portion of the chainstay.
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