Crank change woes

[Milzy]

I’m about to slap a 52 36 on in place of a 50 34.
Would it be a straight swop or is it going to be necessary to move the front mech to accommodate the extra size?
P.S I don’t like messing about with Front mechs.

 

[Heigue'r]

You probably will have to move it up slightly,you might be lucky depending on how much clearance is above the 50T ring allready

 

[smokeysmoo]

I've never had to touch the front mech on my CAAD when I've done the same, never had to alter the chain either it's always been a straight swap

 

[Milzy]

Fingers crossed.

 

[Yellow Saddle]

There is a 4mm difference in radius between a 52 and 50-tooth chainring.
The height of a FD above the largest chainring should be 2mm.
You've introduced a difference of 4mm.

Go figure.

 

[Levo-Lon]

Get a marker pen.
Draw a line through the mach and onto the frame.
Raise the mech so it aligns after tightening, they move as you tighten them.. allow 2-3 mm clearance, jobs a good un.

Use hand gel ect to remove maker pen line

 

[Milzy]

There is a 4mm difference in radius between a 52 and 50-tooth chainring.
The height of a FD above the largest chainring should be 2mm.
You've introduced a difference of 4mm.

Go figure.

Yes indeed, I raised it up a few mm only to reduce a slight rub mind.
Happy days.

 

[ColinJ]

I've never had to touch the front mech on my CAAD when I've done the same, never had to alter the chain either it's always been a straight swap

Blimey - how many times have you done it?!

 

[smokeysmoo]

Blimey - how many times have you done it?!

Quite a few. I decide I'm fit enough to put the 52 back on, then everything goes out the window, fitness drops off a cliff and the compact goes back on 🤣

 

[Milzy]

Quite a few. I decide I'm fit enough to put the 52 back on, then everything goes out the window, fitness drops off a cliff and the compact goes back on 🤣

I’m hoping the opposite happens & I can go 53/39 with a 32t. You never know, we all need a little dream.

 

[ColinJ]

I’m hoping the opposite happens & I can go 53/39 with a 32t. You never know, we all need a little dream.

I'm doing something similar... I have a 46/34 on my CAADX but need to change it to a 53/39. My cousin kindly donated his old Powercranks but the only bike I have with the required BB30 BB is the CAADX. The spider won't take small rings.

(Mind you, I am going to cheat and fit a crazily huge 42-tooth replacement sprocket to my cassette! )

 

[Milzy]

I'm doing something similar... I have a 46/34 on my CAADX but need to change it to a 53/39. My cousin kindly donated his old Powercranks but the only bike I have with the required BB30 BB is the CAADX. The spider won't take small rings.

(Mind you, I am going to cheat and fit a crazily huge 42-tooth replacement sprocket to my cassette! )

I suppose on a gravel style bike with a big 42on the back, pro rings will be great!

 

[ColinJ]

I suppose on a gravel style bike with a big 42on the back, pro rings will be great!

That's the plan. I will have to lose a sprocket in the middle of the cassette but I reckon I can put up with that!

 

[Milzy]

That's the plan. I will have to lose a sprocket in the middle of the cassette but I reckon I can put up with that!

I’m looking at CAADX & Cube Nuroad for Possible cycle to workers next year. Cotic Escapade a contender along with the Canyon grail AL.

 

[ColinJ]

I’m looking at CAADX & Cube Nuroad for Possible cycle to workers next year. Cotic Escapade a contender along with the Canyon grail AL.

I bought my CAADX on eBay for about 50% of list price. It had been used for a year of commuting but was still in very good condition. The original tyres had been swapped out for the commute and put back for the sale so they were unused.