YT Sizing Advice

mick_cornick

Hi bike gurus,

Been pouring over bike reviews and specs for the last few weeks (months?) and YT Jeffsy (29er) is current favourite - All kicked off from the peaslake trek demo day where large Trek fuel ex 9 felt inspiring, very quick up hills and great on the down (including yoghurt pots, Barry KB and steep drop off from lookout). Med follow on trek (not fuel ex) felt less good (more cramped, harder uphill)


Jeffsy is better spec for the price but mail order only so cant try easily: https://www.yt-industries.com/en/detail ... tegory/509


At 178cm high / 83 cm inside leg I am in between med and large according to YT sizing chart


Online advice seems to indicate larger is better for climbing, smaller is better for moving around - its the climbing I need all the help with and what inspired me about the trek fuel ex 9 large and that I really do need a new bike.

Main concern with the Jeffsy large is the combined seatpost + 150mm dropper but YT reply says this is 87cm at minimum post position (fully extended) which is a tad lower than both mine and James' bikes are currently set up for me and comfortable (before I measured for this comparison)


Comparing geometries with current Orange crush (which feels a bit small and difficult to climb) shows the following:






height 178 cm




inside leg 83 cm




belly button to chin (looking ahead) 55 cm Standing “attack position” for downhill, belly button = centre of gravity over BB on flat, chin over headtube
crush top of seat to pedal top 93 cm




James road bike adjusted to me: top of seat to top of pedal 91 cm




YT e-mail reply: top of seat to centre of pedal (L) 87 cm

















demo day

mm Jeffsy Fuel ex 9 My Crush
Sizes M
L

http://forums.mtbr.com/yt/anyone-got-th ... st12687362 XL M (18.5) L (19.5)

A Toptube length 592 616 637 617 632 590
B Reach 425 445 465 450 465 360
stem 50 60 60 35 35 75
reach + stem 475 505 525 485 500 435
Toptube + stem 642 676 697 652 667 665
Rs / ts 0.74 0.75 0.75 0.74 0.75 0.65
C Stack 610 623 628 603 603 610
crank 175 175 175 175 175 175
Stack + crank (175mm) 785 798 803 778 778 785
D Seattube length 440 480 520 440 470 435
dropper extension 150 150 150 125 125

dropper collar 28 28 28 28 28

dropper total 178 178 178 153 153

saddle depth (crush) 55 55 55 55 55 55
seat to peddle (dropper lowest position) 848 888 928 823 853

E Chainstay length 435 440 440 432 432 435
F Headtube angle low/high 66,9 / 67,6 ° 66,9 / 67,6 ° 66.9/67.6 67.7 67.7 68
G Seattube angle (eff.) low/high 74,7 / 75,3 ° 74,7 / 75,3 ° 74.7/75.3

73
H BB Drop low/high 32/24 mm 32/24 mm 32/34 337 337 5
I Wheelbase 1154 1178 1205 1173 1188 1135
J Headtube length 95 110 115 100 100 150
K Steerer tube length 551 551 551 510 510 520
L Fork offset 46 46 46

30

BloggingFit

I would be on a large rather than medium. More because of showing a lot of seat post on the medium rather than the shorter reach. I'd just use a 125mm dropper on the large and look to use a 35mm stem to bring the bars back to a good position if required.

Herdwick

I am 185 and got an xl jeffsy, you should be fine on a L I believe, if it feels a bit long, which I doubt, you can always use a shorter stem
Never measured my inseam but have the dropper collar some 30-35 mm up from the top of seat tube
Brilliant bike although a touch on the heavy side but pedals great, an issue with the rear shock today will give me the chance to test a direct sales company their warranty, will let you know

rockmonkeysc

If you're not sure then mail order isn't a good idea.

Herdwick

basicaly if you know what fits you go mail order, or get a crappy spec bike for the money from a shop, and again fitment is not guarrantied

rockmonkeysc

Doesn't matter how good the spec is if it's not the right size.
You can get equally good value from shops, especially at this time of year if you shop around. Most good shops will either have demo bikes or at least give decent sizing advice. Just don't take advice from a salesmen who's a roadie and don't buy from shops with loads of road bikes and a couple mountain bikes.

Herdwick

RockmonkeySC wrote:

Just don't take advice from a salesmen who's a roadie and don't buy from shops with loads of road bikes and a couple mountain bikes.

I'm bound to agree