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Would 165 mm Tiagra cranks work with 170 mm 105 rings? nm(12 posts)

Would 165 mm Tiagra cranks work with 170 mm 105 rings? nmEug
Apr 16, 2003 2:22 PM
nm
Yes, but the Tiagra crank is crap (nm)TJeanloz
Apr 16, 2003 2:45 PM
Why. Is it just weight? (nm)Eug
Apr 16, 2003 3:57 PM
They are fine.AllUpHill
Apr 16, 2003 4:17 PM
I have the Tiagra group on one of my frames. I've had it since 2000 when the group came out. Yes, it's heavy, but works very nicely in my experience (I own a dura-ace group for comparison). And durable too. I have not replaced a single part, not even the chain, in the 3 years and many thousands of miles. I believe 10 to 15 thousand. I keep waiting for the drivetrain to fall apart but it shows no signs. (the right shifter is just now starting to crap about, but that's allowable).
Ahem.Ahimsa
Apr 16, 2003 4:36 PM
While I generally agree with TJeanloz's opinion regarding all things bike related, I must protest the supposition that there is anything inherently wrong with a Tiagra crankset that would mark it as being considered "crap".

Unless one intends to race a bike, I see the Tiagra line (with the possible exception of the brifters) as being a perfectly servicable option for the average recreational cyclist.

The only time I would recommend otherwise is in the case of one shopping for components and asking if the...say...$9 upcharge for 105 is worth it. In that case I would council against Tiagra, but to mislead someone into thinking that Tiagra is outright garbage is silly.

To answer your original question with more clarity, 170 and 165 refer to the crankarm length, and have no relation to the chainrings. The chainring measurement is related to the bolt circle diameter. As long as you match the BCD from the crank to that of the rings, you should (in
b most
cases) be just fine if you stick to the same manufacturer (IE: Shimano 130 BCD rings to a Shimano crankset).

It can get more complicated than that on occasion, but hey....that's what this forum is for, eh?

When in doubt...

Cheers!

A.
BB isn't compatible? Is Tiagra tapered? Cheap 165 105 anywhere?Eug
Apr 16, 2003 5:46 PM
I have 170 mm 105 now and want to try a 165 mm. Am I right to think Tiagra is square and 105 is splined? So Tiagra wouldn't fit.

So I guess I have to find 105s in the 165 mm size somewhere. Anyone know of a cheap source, that ships to Canada?

I was hoping to try cheap Tiagras first since I've never tried 165 mm before, but I guess I'm outa luck.
Yes...Yes...Maybe...Ahimsa
Apr 16, 2003 6:18 PM
-I have 170 mm 105 now and want to try a 165 mm.

If you are sure you really want to bother... I'm guessing you are trying to deal with knee pain?

-Am I right to think Tiagra is square and 105 is splined? So Tiagra wouldn't fit.

That would be correct assuming we are talking about new parts. Current Tiagra = square and current 105 = splined. If you have older 105 then it could be tapered. Take the crankarm off and look.

-So I guess I have to find 105s in the 165 mm size somewhere. Anyone know of a cheap source, that ships to Canada?

No place special off the top of my head. I'd recommend all the usual places...Bikeman.com is good. Try the classifieds or Ebay.

-I was hoping to try cheap Tiagras first since I've never tried 165 mm before, but I guess I'm outa luck.

Not really. If you look, you will find a cheap 105 set. Be sure to offer us your old 105 crankset here though. I'm sure that at the right price we could find a suitable home for it.

Cheers!

A.
2002 105 - probably splined. Yes to deal with knee pain.Eug
Apr 16, 2003 7:11 PM
Thanks for the info. Yes to deal with knee pain. 5'7" 31ish inch inseam.

2002 105, so I assume it's splined.

On my MTB:
175 mm - both knees terrible pain.
170 mm - right usually OK, left knee hurts after heavy riding

On my road bike:
170 mm - right usually OK, left knee hurts after heavy riding

Thanks for the bikeman suggestion. They ship to Canada and have the 165 mm 105. If I can't find it locally for a competitive price, then I'll order from bikeman.
2002 105 - probably splined. Yes to deal with knee pain.Nug
Apr 16, 2003 7:39 PM
If you're riding clipless, you may want to be absolutely sure you can't fix that with some cleat adjustment (especially since one side bothers more). That may take time, but if that's the problem another crankset won't fix things anyway (and it's free).
Been adjusting cleats for 2 years.Eug
Apr 16, 2003 8:00 PM
I've even had two pedal/bike fits at stores, once with some weird pedal contraption. That plus tweaks has minimized pain, but I still get left sided pain. The smaller cranks is a last resort.

(I think my left leg is ever so slightly smaller, but I'm not sure.)
have you tried stretching?Becky
Apr 17, 2003 3:19 AM
I dealt with some awful pain in my left knee (my shorter leg by about 1/4", FWIW) that wasn't resolved with cleat adjusts, saddle height adjusts, etc. Finally went to see a doctor and he recommended a mixture of exercises to strengthen the inner quad muscles of the affected leg and some serious stretching. I've been sticking with the stretching program and it's made a huge difference. Give it a try- it may work for you too.
Best of luck!

Becky
My appt. with a sports physio is already booked.Eug
Apr 17, 2003 4:22 AM
Good advice. I'm going to see a sports physio, who happens to be a biker too.

As for stretching and strength, good advice. I've been told it depends on the specific diagnosis however for what is specifically recommended.