Will this bike fit me??

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Will this bike fit me??

Postby Rgp1990 » Thu Oct 19, 2017 3:44 pm

Hi All,

A friend of mine is just about to sell his Giant Defy Disc 1 (2016 model), it is a M/L size. I have the chance to buy it at quite a good price however without riding it, thought id ask if I should even bother, given that I'm 5'9" tall.

Link to the geometries here:


Would be great if someone was able to explain how you work what bike size to go for without actually sitting on the bike :) Appreciate, however, that actually test riding may be the best option. Plan is to do this at some point over the next week.

From a very brief google, the bike has received many good reviews with no issues. Does anyone have an opinion on this?


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biker jk
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Re: Will this bike fit me??

Postby biker jk » Thu Oct 19, 2017 4:36 pm

It's likely too big for you. Giant recommends M/L for a height of 178-183cm and M for 173-178cm.

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Derny Driver
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Re: Will this bike fit me??

Postby Derny Driver » Thu Oct 19, 2017 6:12 pm

Agree with biker. Im 5'9 and ride 55cm bikes. M=54.5 and M/L=56
But it might be worth trying it out. Its close to being okay.
With the sloping top tube the seat height wont be a problem.
A 1 cm shorter stem may do the job. Try it.

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Re: Will this bike fit me??

Postby g-boaf » Fri Oct 20, 2017 5:17 am

It will probably just fit, but might not feel right.

I'm your size and ride M in the Giant frames.

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Re: Will this bike fit me??

Postby Discodan » Fri Oct 20, 2017 8:40 am

Yes technically it's a bit big but as Derney says the seat height will be fine and $30 on a shorter stem is nothing if you can get it a good price

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Re: Will this bike fit me??

Postby bychosis » Fri Oct 20, 2017 9:03 am

It also depends a bit on your body proportions. I am short of leg, so can fit a larger frame than most my size because I have a longer reach. Sloping top tubes make this easier because there is more saddle adjustment. If you happened to have long legs, and therefore shorter reach, you might struggle on a larger frame because it is more difficult to shorten the reach to the bars than it is to raise a saddle.

Throw a leg over and see how it fits, you might be lucky.
bychosis (bahy-koh-sis): A mental disorder of delusions indicating impaired contact with a reality of no bicycles.

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